SSAT Elementary Level Math : How to find the area of a rectangle

Study concepts, example questions & explanations for SSAT Elementary Level Math

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Example Questions

Example Question #1 : How To Find The Area Of A Rectangle

Aaron and his family just moved into a new house. He wants to figure out the size of his new room. It is a rectangle. One side is 12 feet and the other side is 10 feet. What is the area of his new room?

Possible Answers:

\(\displaystyle 22ft^{2}\)

\(\displaystyle 100ft^{2}\)

\(\displaystyle 44ft^{2}\)

\(\displaystyle 120ft^{2}\)

\(\displaystyle 12ft^{2}\)

Correct answer:

\(\displaystyle 120ft^{2}\)

Explanation:

To find the area of a rectangle, multiply the length by the width \(\displaystyle (l \times w)\).

The question tells us that the length is 12 feet and the width is 10 feet.

\(\displaystyle 12 ft \times10ft = 120ft^{2}\)

Example Question #1 : Rectangles

If Tim draws a rectangle with a long side of 8 mm and a short side of 4 mm, what is the area? 

 

Possible Answers:

\(\displaystyle 24mm^{2}\)

\(\displaystyle 12mm^{2}\)

\(\displaystyle 32mm^{2}\)

\(\displaystyle 28mm^{2}\)

Correct answer:

\(\displaystyle 32mm^{2}\)

Explanation:

To find the area of a rectangle, multiply the length (8mm) by the width (4mm).

\(\displaystyle 8mm\times 4mm=32mm^{2}\)

Therefore, the area is \(\displaystyle 32mm^{2}\).

Example Question #1 : Rectangles

Screen_shot_2013-12-23_at_8.09.23_pm

What is the area of the above rectangle? 

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 16\)

\(\displaystyle 24\)

\(\displaystyle 38\)

\(\displaystyle 12\)

Correct answer:

\(\displaystyle 24\)

Explanation:

To find the area of the rectangle, multiply the longer side (8) and shorter side (3) together.

\(\displaystyle 8\times 3=24\)

Example Question #61 : Geometry

John needs a tablecloth that covers his entire dining room table. The tabletop measures 4 feet by 7 feet. Which of the following tablecloths should John buy? 

Possible Answers:

\(\displaystyle \fn_cm 27\:ft^2\)

\(\displaystyle 11\:ft^2\)

\(\displaystyle 22\:ft^2\)

\(\displaystyle \fn_cm \fn_cm 32\:ft^2\)

Correct answer:

\(\displaystyle \fn_cm \fn_cm 32\:ft^2\)

Explanation:

The tablecloth measurements are areas, shown by the \(\displaystyle ft^2\) units in the answer choices. Since the tabletop is 4 ft by 7 ft, John needs a tablecloth with an area of AT LEAST \(\displaystyle 28\: ft^2\).  

\(\displaystyle \fn_cm \fn_cm 32\:ft^2\) is the only answer choice that meets that requirement. 

Example Question #61 : Plane Geometry

Screen_shot_2014-01-02_at_10.15.24_pm

What is the area of the above rectangle?

Possible Answers:

\(\displaystyle 33\)

\(\displaystyle 15\)

\(\displaystyle 36\)

\(\displaystyle 16\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 36\)

Explanation:

To find the area of the rectangle, multiply the longer side (12) and the shorter side (3) together. 

\(\displaystyle 12\times 3 = 36\)

Example Question #3 : How To Find The Area Of A Rectangle

A rectangle has a perimeter of \(\displaystyle 20\ m\). One of its sides has a length of \(\displaystyle 4\ m\).

What is the area of the rectangle?

Possible Answers:

\(\displaystyle 20\ m^2\)

\(\displaystyle 24\ m^2\)

\(\displaystyle 36\ m^2\)

\(\displaystyle 40\ m^2\)

\(\displaystyle 64\ m^2\)

Correct answer:

\(\displaystyle 24\ m^2\)

Explanation:

The perimeter of a figure is the sum of the lengths of all its sides. Every rectangle has two sets of two equal-length sides. One set of sides is \(\displaystyle 4\ m\) each, or \(\displaystyle 8\ m\) when added together.

\(\displaystyle 2 \times 4\ m = 8\ m\)

We subtract \(\displaystyle 8\ m\) from the total \(\displaystyle 20\ m\) perimeter to find the lengths of the remaining sides.

\(\displaystyle 20\ m - 8\ m = 12\ m\)

Since there are two remaining sides, the length of each of the remaining sides must be \(\displaystyle 6\ m\).

\(\displaystyle 12\ m \div 2=6\ m\)

The area of a rectangle is given by multiplying the length of its longer side by the length of its shorter side.

\(\displaystyle 6\ m \times 4\ m = 24\ m^2\)

Example Question #64 : Quadrilaterals

Screen_shot_2014-02-12_at_9.31.18_pm

What is the area of the above rectangle?

Possible Answers:

\(\displaystyle 75\)

\(\displaystyle 57\)

\(\displaystyle 12\)

\(\displaystyle 35\)

\(\displaystyle 24\)

Correct answer:

\(\displaystyle 35\)

Explanation:

To find the area of the rectangle, multiply the longer side (7) and the shorter side (5) together.

\(\displaystyle $7\times 5 = 35\)

Example Question #71 : Plane Geometry

Screen_shot_2014-03-04_at_9.28.42_pm

What is the area of the rectangle?

Possible Answers:

\(\displaystyle 32\)

\(\displaystyle 24\)

\(\displaystyle 19\)

\(\displaystyle 17\)

\(\displaystyle 27\)

Correct answer:

\(\displaystyle 27\)

Explanation:

To find the area of a rectangle, multiply the width by the length.

\(\displaystyle $9\times 3$ = 27\)

Example Question #72 : Plane Geometry

Screen_shot_2014-03-16_at_5.20.52_pm

What is the area of the rectangle?

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 45\)

\(\displaystyle 72\)

\(\displaystyle 59\)

\(\displaystyle 65\)

Correct answer:

\(\displaystyle 65\)

Explanation:

To find the area of a rectangle, multiply the length of the longer side by the shorter side.

\(\displaystyle 13 \times 5 = 65\)

Example Question #2 : Rectangles

Bdaycake

A rectangular birthday cake (shown in the diagram) measures 8 inches by 12 inches. The cake is then divided into four identical rectangular slices. What is the area of each slice?

Possible Answers:

\(\displaystyle 6\:in^2\)

\(\displaystyle 26\ in^2\)

\(\displaystyle 24\:in^2\)

\(\displaystyle 12\:in^2\)

\(\displaystyle 10\:in^2\)

Correct answer:

\(\displaystyle 24\:in^2\)

Explanation:

\(\displaystyle Area_{cake} = 12\times8=96\)

\(\displaystyle Area_{slice}=Area_{cake}\div4=96\div4=24.\)

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