Find the Area of a SquareExample 1

Find the area of the square.

SOLUTION

Use the formula for the area of a square and substitute 9 for s.

A = s2 Formula for the area of a square

= 92 Substitute 9 for s.

= 81 Simplify.

The area of the square is 81 square feet.ANSWER

Find the Area of a RectangleExample 2

Find the area of the rectangular pool.

Use the formula for the area of a rectangle. Substitute 24 for b and 16 for h.

SOLUTION

A = bh Formula for the area of a rectangle

= 24 · 16 Substitute 24 for b and 16 for h.

= 384 Multiply.

The area of the pool is 384 square feet.ANSWER

Find the Height of a RectangleExample 3

Use the formula for the area of a rectangle and substitute 54 for A and 9 for b.

SOLUTION

A = bh Formula for the area of a rectangle

54 = 9h Substitute 54 for A and 9 for b.

6 = h Divide each side by 9.

The height of the rectangle is 6 inches.ANSWER

The rectangle has an area of 54 square inches. Find its height.

Checkpoint Area of Squares and Rectangles

Find the area of the quadrilateral.

1.

2.

3.

A rectangle has an area of 52 square meters and a height of 4 meters. Find the length of its base.

4.

ANSWER 121 m2

ANSWER 12 ft2

ANSWER 26.55 yd2

ANSWER 13 m