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EXAMPLE 1

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

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EXAMPLE 1

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

  2. ( 8)( 5) = ANSWER The perimeter is26feet, and the area is40square feet. EXAMPLE 1 Finding Perimeter and Area Find the area. A=lw Write formula. Substitute. Multiply. = 40

  3. Find the side length of a square with an area of81square feet. ANSWER The side length of the square is 9 feet. EXAMPLE 2 Finding Side Length A= s2 Write formula for area of a square. 81= s2 Substitute 81for A. 9= s Use mental math:92 = 81.

  4. d = r t = 26.45 ANSWER The rabbit travels132feet in5seconds. EXAMPLE 3 Using the Distance Formula Rabbits A rabbit is running at a rate of26.4feet per second. How far does the rabbit travel in5seconds? SOLUTION Write distance formula. Substitute26.4for r and5 for t. = 132 Multiply.

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

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

  7. GUIDED PRACTICE for Examples 1, 2 and 3 Find the side length of the figure. 3. rectangle: A= 91 cm2, l= 13 cm, w= ? A= lw Write formula for area of a rectangle. 91= 13w Substitute 91for A. 7= w

  8. GUIDED PRACTICE for Examples 1, 2 and 3 Find the side length of the figure. 4.square: A= 100yd2,s= ? A= s2 Write formula for area of a square. 100= s2 Substitute 100for A. 10= s

  9. 5.Distance How far does a car travel in 2hours at a rate of40mi/h? = 40 2 mi/h ANSWER The car can travel 80 mi in 2 hours at a Rate of 40 GUIDED PRACTICE for Examples 1, 2 and 3 D= st Write formula for distance. Substitute 40 for speed and 2 for time. = 80

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