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ACT Math : How to find the area of a square

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

How much more area does a square with a side of 2r have than a circle with a radius r? Approximate π by using 22/7.

Possible Answers:

1/7 square units

6/7 square units

12/14 square units

4/7 square units

Correct answer:

6/7 square units

Explanation:

The area of a circle is given by A = πr² or 22/7r²

The area of a square is given by A = s² or (2r)² = 4r²

Then subtract the area of the circle from the area of the square and get 6/7 square units.

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Example Question #2 : Squares

If the perimeter of a square is 44 centimeters, what is the area of the square in square centimeters?

Possible Answers:

$\dpi{100} \small 81$

$\dpi{100} \small 144$

$\dpi{100} \small 100$

$\dpi{100} \small 121$

$\dpi{100} \small 88$

Correct answer:

$\dpi{100} \small 121$

Explanation:

Since the square's perimeter is 44, then each side is $\dpi{100} \small \frac{44}{4}=11$ .

Then in order to find the area, use the definition that the

$\dpi{100} \small Area=side^{2}$

$\dpi{100} \small 11^{2}=121$

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

Midpointsquare

Given square ABCD , with midpoints on each side connected to form a new, smaller square. How many times bigger is the area of the larger square than the smaller square?

Possible Answers:

$2\sqrt{2}$

$\frac{\sqrt{2}}{2}$

$\sqrt{2}$

Correct answer:

Explanation:

Assume that the length of each midpoint is 1. This means that the length of each side of the large square is 2, so the area of the larger square is 4 square units. $A=s^{2}$

To find the area of the smaller square, first find the length of each side. Because the length of each midpoint is 1, each side of the smaller square is $\sqrt{2}$ (use either the Pythagorean Theorem or notice that these right trianges are isoceles right trianges, so $s, s, s\sqrt{2}$ can be used).

The area then of the smaller square is 2 square units.

Comparing the area of the two squares, the larger square is 2 times larger than the smaller square.

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Example Question #3 : Squares

If a completely fenced-in square-shaped yard requires 140 feet of fence, what is the area, in square feet, of the lot?

Possible Answers:

140

4900

1225

Correct answer:

1225

Explanation:

Since the yard is square in shape, we can divide the perimeter(140ft) by 4, giving us 35ft for each side. We then square 35 to give us the area, 1225 feet.

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

The perimeter of a square is $\textup{in}$ . What is its area?

Possible Answers:

144 $\textup{in}^2$

125 $\textup{in}^2$

156.25 $\textup{in}^2$

175.25 $\textup{in}^2$

$\textup{Not enough information provided}$

Correct answer:

156.25 $\textup{in}^2$

Explanation:

The perimeter of a square is very easy to calculate. Since all of the sides are the same in length, it is merely:

4s=p

4s=50

s=12.5

From this, you can calculate the area merely by squaring the side's value:

A = 12.5^2=156.25 $\textup{in}^2$

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Example Question #2 : How To Find The Area Of A Square

What is the area of a square with a side length of $14\textup{yd}$ ?

Possible Answers:

$\textup{yd}^2$

196 $\textup{yd}^2$

144 $\textup{yd}^2$

Correct answer:

196 $\textup{yd}^2$

Explanation:

The area of a square is very easy. You merely need to square the length of any given side. That is, the area is defined as:

A=s^2

For our data, this is:

A=14^2=196

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

What is the area of a square with a perimeter of ft?

Possible Answers:

144ft

144ft^2

48ft^2

Not enough information is given.

576ft^2

Correct answer:

144ft^2

Explanation:

For a square all the sides are equal, and there are four sides, so divide the perimeter by 4 to determine the side length.

s = 48/4 = 12 .

Next to find the area of a square, square the side length:

A = s^2 = 12^2 = 144ft^2 .

Don't forget your units!

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

Eric has 160 feet of fence for a parking lot he manages. If he is using all of the fencing, what is the area of the lot assuming it is square?

Possible Answers:

$80\ feet^{2}$

$16,000\ feet^{2}$

$160\ feet^{2}$

$1600\ feet^{2}$

$1200\ feet^{2}$

Correct answer:

$1600\ feet^{2}$

Explanation:

The area of a square is equal to its length times its width, so we need to figure out how long each side of the parking lot is. Since a square has four sides we calculate each side by dividing its perimeter by four.

$\frac{160}{4}=40$

Each side of the square lot will use 40 feet of fence.

$Area=length \times width$

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Example Question #4 : How To Find The Area Of A Square

A square garden is inscribed inside a circular cobblestone path. If the radius of the cobblestone path is feet, what is the area of the garden?

Possible Answers:

2500ft^2

4050ft^2

3850ft^2

5000ft^2

2700ft^2

Correct answer:

4050ft^2

Explanation:

If a square is inscribed inside a circle, the diameter of the circle is the diagonal of the square. Since we know the radius of the circle is feet, the diameter must be feet. Thus, the diagonal of the square garden is feet.

All squares have congruent sides; thus, the diagonal of a square creates two isosceles right triangles. The ratio of the lengths of the sides of an isosceles right triangle are $x: x: x\sqrt2$ , where $x\sqrt2$ is the hypotenuse. Thus, to find the length of a side of a square from the diagonal, we must divide by $\sqrt2$ .

$s = \frac{90}{\sqrt2} = \frac{90\sqrt2}{2} = 45\sqrt2$

The area of a square is A = s^2 , so if one side is $45\sqrt2$ , our area is

$A = s^2 = (45\sqrt2)^2 = (2025\cdot 2) = 4050$

Thus, the area of our square garden is 4050ft^2

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

Find the area of a square whose side length is .

Possible Answers:

Correct answer:

Explanation:

To find area, simply square the side length. Thus,

A=1^2=1

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ACT Math : How to find the area of a square

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

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

Example Question #2 : Squares

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

Example Question #3 : Squares

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

Example Question #2 : How To Find The Area Of A Square

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

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

Example Question #4 : How To Find The Area Of A Square

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

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