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High School Math : How to find the length of the side of a square

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

The area of square R is 12 times the area of square T. If the area of square R is 48, what is the length of one side of square T?

Possible Answers:

Correct answer:

Explanation:

We start by dividing the area of square R (48) by 12, to come up with the area of square T, 4. Then take the square root of the area to get the length of one side, giving us 2.

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

When the side of a certain square is increased by 2 inches, the area of the resulting square is 64 sq. inches greater than the original square. What is the length of the side of the original square, in inches?

Possible Answers:

Correct answer:

Explanation:

Let x represent the length of the original square in inches. Thus the area of the original square is x². Two inches are added to x, which is represented by x+2. The area of the resulting square is (x+2)². We are given that the new square is 64 sq. inches greater than the original. Therefore we can write the algebraic expression:

x² + 64 = (x+2)²

FOIL the right side of the equation.

x² + 64 = x² + 4x + 4

Subtract x²from both sides and then continue with the alegbra.

64 = 4x + 4

64 = 4(x + 1)

16 = x + 1

15 = x

Therefore, the length of the original square is 15 inches.

If you plug in the answer choices, you would need to add 2 inches to the value of the answer choice and then take the difference of two squares. The choice with 15 would be correct because 17² -15² = 64.

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Example Question #111 : Quadrilaterals

If the area of a square is 25 inches squared, what is the perimeter?

Possible Answers:

Not enough information

Correct answer:

Explanation:

The area of a square is equal to length times width or length squared (since length and width are equal on a square). Therefore, the length of one side is $l = \sqrt{25in^{2}}$ or $l=5 in.$ The perimeter of a square is the sum of the length of all 4 sides or $4 \times 5 in. =20 in.$

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

Circleinsquare

A square is inscribed inside a circle, as illustrated above. The radius of the circle is $\frac{3\sqrt{2}}{2}$ units. If all of the square's diagonals pass through the circle's center, what is the area of the square?

Possible Answers:

$\frac{9}{2}$ units squared

units squared

$\frac{9}{4}$ units squared

units squared

Correct answer:

units squared

Explanation:

Given that the square's diagonals pass through the circle's center, those diagonals must each form a diameter of the circle. The circle's diameter is twice its radius, i.e. $2 \times \frac{3\sqrt{2}}{2}$ , which is $3\sqrt{2}$ . Since this diameter (i.e., the square's diagonal) is the hypotenuse of a right triangle formed by two sides of the square, the length of one of the square's sides can be calculated with the Pythagorean Theorem. replace and because the sides of the square must be equal in length. Since the objective is to solve for the square's area, solve for s^2 since one side squared will be the square's area.

$s^2 + s^2 = (3\sqrt{2})^2$

$\rightarrow 2s^2 = 18$

$\rightarrow s^2 = 9$ units squared

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High School Math : How to find the length of the side of a square

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

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

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

Example Question #111 : Quadrilaterals

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

All High School Math Resources

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