Common Core: High School - Geometry : Identify Shapes in 2D Cross-Sections and Rotations in 3D: CCSS.Math.Content.HSG-GMD.B.4

Study concepts, example questions & explanations for Common Core: High School - Geometry

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All Common Core: High School - Geometry Resources

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Example Questions

Example Question #1 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a cylinder with radius \displaystyle 9 and height \displaystyle 90 find the area of a cross section that's parallel to its base. Round your answer to the nearest tenth.

Possible Answers:

\displaystyle 8100.0

\displaystyle 25446.9

\displaystyle 81.0

\displaystyle 254.5

\displaystyle 22902.2

Correct answer:

\displaystyle 254.5

Explanation:

The first step is see what the cross section parallel to the base looks like.

Since we are dealing with a cylinder, the cross section that we are dealing with parallel to the base is a circle.

So all we need to do is recall the area of a circle equation, and substitute the radius given for \displaystyle r.

\displaystyle \\A = \pi r^{2} \\A= \pi \cdot 9 ^2 \\A = 81 \pi \\A = 254.469004940773

Now we round our answer to the nearest tenth

\displaystyle A = 254.5

Example Question #1 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 9764 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 1.6

\displaystyle 48.3

\displaystyle 213.0

\displaystyle 13.3

\displaystyle 175.8

Correct answer:

\displaystyle 175.8

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 9764 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for \displaystyle r

\displaystyle \\7323 = \pi r^{3} \\\\\frac{7323}{\pi} = r^{3} \\r=\sqrt[3]{ \frac{7323}{\pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 13.259069706343505 ^2 \\A= 175.80292947767606

Now we round our answer to the nearest tenth, which is

\displaystyle A= 175.8

Example Question #1 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 8472 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 45.0

\displaystyle 193.7

\displaystyle 1.6

\displaystyle 159.9

\displaystyle 12.6

Correct answer:

\displaystyle 159.9

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 8472 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\6354 = \pi r^{3} \\\\\frac{6354}{\pi} = r^{3} \\r=\sqrt[3]{ \frac{6354}{\pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 12.646366950388915 ^2 \\A= 159.930597043889

Now we round our answer to the nearest tenth, which is

\displaystyle A= 159.9

Example Question #1 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 5124 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 1.6

\displaystyle 138.6

\displaystyle 35.0

\displaystyle 10.7

\displaystyle 114.4

Correct answer:

\displaystyle 114.4

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 5124 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\3843 = \pi r^{3} \\\\\frac{3843}{\pi} = r^{3} \\r=\sqrt[3]{ \frac{3843}{\pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 10.694820600410134 ^2 \\A= 114.379187674957

Now we round our answer to the nearest tenth, which is

\displaystyle A= 114.4

Example Question #4 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 4440 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 32.6

\displaystyle 104.0

\displaystyle 10.2

\displaystyle 125.9

\displaystyle 1.6

Correct answer:

\displaystyle 104.0

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 4440 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\3330 = \pi r^{3} \\\\\frac{3330}{\pi} = r^{3} \\r=\sqrt[3]{ \frac{3330}{\pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 10.196038192871926 ^2 \\A= 103.95919483050302

Now we round our answer to the nearest tenth, which is

\displaystyle A= 104.0

Example Question #1 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 6254 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 11.4

\displaystyle 1.6

\displaystyle 158.2

\displaystyle 38.6

\displaystyle 130.6

Correct answer:

\displaystyle 130.6

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 6254 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\\frac{9381}{2} = \pi r^{3} \\\\\frac{9381}{2 \pi} = r^{3} \\r=\sqrt[3]{ \frac{9381}{2 \pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 11.429390973615462 ^2 \\A= 130.6309780277626

Now we round our answer to the nearest tenth, which is

\displaystyle A= 130.6

Example Question #2 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 4276 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

 

Possible Answers:

\displaystyle 122.8

\displaystyle 1.6

\displaystyle 32.0

\displaystyle 10.1

\displaystyle 101.4

Correct answer:

\displaystyle 101.4

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 4276 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\3207 = \pi r^{3} \\\\\frac{3207}{\pi} = r^{3} \\r=\sqrt[3]{ \frac{3207}{\pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 10.06892321760049 ^2 \\A= 101.38321476193423

Now we round our answer to the nearest tenth, which is

\displaystyle A= 101.4

Example Question #8 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a sphere with a volume of \displaystyle 3242 find the area of the perpendicular cross section right through its center. Round your answer to the nearest tenth.

Possible Answers:

\displaystyle 27.8

\displaystyle 84.3

\displaystyle 9.2

\displaystyle 102.1

\displaystyle 1.6

Correct answer:

\displaystyle 84.3

Explanation:

The first step is to recall the volume equation of a sphere.

\displaystyle V = \frac{4 \pi}{3} r^{3}

Since we are given the volume, we can plug it in for V

\displaystyle 3242 = \frac{4 \pi}{3} r^{3}

Since we want to find the area of the perpendicular cross section, we need to find what the radius is.

Now we solve for r

\displaystyle \\\frac{4863}{2} = \pi r^{3} \\\\\frac{4863}{2 \pi} = r^{3} \\r=\sqrt[3]{ \frac{4863}{2 \pi} }

Now we can use the radius we found to find the area of the cross section.

The cross section in this case is a circle, so now we will use the area of a circle formula, which is

\displaystyle A = \pi r^{2}

Now we simply substitute the radius we just found for \displaystyle r.

\displaystyle \\A= \pi \cdot 9.18138362235783 ^2 \\A= 84.29780522090057

Now we round our answer to the nearest tenth, which is

\displaystyle A= 84.3

Example Question #8 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a cylinder with radius \displaystyle 6 and height \displaystyle 13 find the area of a cross section that's parallel to its base. Round your answer to the nearest tenth.

Possible Answers:

\displaystyle 530.9

\displaystyle 36.0

\displaystyle 113.1

\displaystyle 1470.3

\displaystyle 169.0

Correct answer:

\displaystyle 113.1

Explanation:

The first step is see what the cross section parallel to the base looks like.

Since we are dealing with a cylinder, the cross section that we are dealing with parallel to the base is a circle.

So all we need to do is recall the area of a circle equation, and substitute the radius given for \displaystyle r.

\displaystyle \\A = \pi r^{2} \\A= \pi \cdot 6 ^2 \\A = 36 \pi \\A = 113.097335529233

Now we round our answer to the nearest tenth

\displaystyle A = 113.1

Example Question #9 : Identify Shapes In 2 D Cross Sections And Rotations In 3 D: Ccss.Math.Content.Hsg Gmd.B.4

Given a cylinder with radius \displaystyle 8 and height \displaystyle 77 find the area of a cross section that's parallel to its base. Round your answer to the nearest tenth.

Possible Answers:

\displaystyle 64.0

\displaystyle 201.1

\displaystyle 15481.8

\displaystyle 5929.0

\displaystyle 18626.5

Correct answer:

\displaystyle 201.1

Explanation:

The first step is see what the cross section parallel to the base looks like.

Since we are dealing with a cylinder, the cross section that we are dealing with parallel to the base is a circle.

So all we need to do is recall the area of a circle equation, and substitute the radius given for \displaystyle r.

\displaystyle \\A = \pi r^{2} \\A= \pi \cdot 8 ^2 \\A = 64 \pi \\A = 201.061929829747

Now we round our answer to the nearest tenth

\displaystyle A = 201.1

All Common Core: High School - Geometry Resources

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