1. EXAMPLE 1 Finding Perimeter and Area SOLUTION Find the perimeter. P = 2l + 2w Write formula. = 2 ( 8 ) + 2( 5 ) Substitute. = 26 Multiply, then add. Find the perimeter and area of the rectangle.

2. EXAMPLE 1 Finding Perimeter and Area Find the area. A = lwA = lw = 40 Write formula. Substitute. Multiply. ANSWER The perimeter is 26 feet, and the area is 40 square feet. ( 8 )( 5 ) =

3. EXAMPLE 2 Finding Side Length A = s 2 81 = s 2 9 = s Write formula for area of a square. Substitute 81 for A. Use mental math: 9 2 = 81. ANSWER The side length of the square is 9 feet. Find the side length of a square with an area of 81 square feet.

4. EXAMPLE 3 Using the Distance Formula Rabbits A rabbit is running at a rate of 26.4 feet per second. How far does the rabbit travel in 5 seconds? SOLUTION = 132 Write distance formula. Substitute 26.4 for r and 5 for t. Multiply. ANSWERThe rabbit travels 132 feet in 5 seconds. d = r t = 26.4 5

5. GUIDED PRACTICE for Examples 1, 2 and 3 Find the perimeter and area of the figure. 1. rectangle: l = 25 in., w = 14 in. P = 2l + 2w Write formula. = 2 ( 25 ) + 2( 14 ) Substitute. = 78 in. Multiply, then add. SOLUTION A = lw = 350 in. 2 Write formula. Substitute. Multiply. ( 25 )( 14 ) =

6. GUIDED PRACTICE for Examples 1, 2 and 3 Find the perimeter and area of the figure. 2. square: s = 7 in. P = 2l + 2w Write formula. = 2 ( 7) + 2( 7) Substitute. = 28 in. Multiply, then add. SOLUTION A = lw = 49 in. 2 Write formula. Substitute. Multiply. ( 7 )( 7 ) =

7. GUIDED PRACTICE for Examples 1, 2 and 3 Find the side length of the figure. 3. rectangle: A = 91 cm 2, l = 13 cm, w = ? A = lw 91 = 13w 7 = w Write formula for area of a rectangle. Substitute 91 for A.

8. GUIDED PRACTICE for Examples 1, 2 and 3 Find the side length of the figure. 4. square: A = 100 yd 2, s = ? A = s 2 100 = s 2 10 = s Write formula for area of a square. Substitute 100 for A.

9. GUIDED PRACTICE for Examples 1, 2 and 3 5. Distance How far does a car travel in 2 hours at a rate of 40 mi/h? D = st = 40 2 = 80 Write formula for distance. Substitute 40 for speed and 2 for time. ANSWER The car can travel 80 mi in 2 hours at a Rate of 40 mi/h