Perimeter Calculation for Rectangles and Squares

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Example 5-2b Objective Find the perimeters of rectangles and squares

Example 5-2b Vocabulary Perimeter The sum of the lengths and the widths P = 2L + 2W

Lesson 5 Contents Example 1Find the Perimeter Example 2Find the Perimeter of a Square

Example 5-1a Find the perimeter of the rectangle. Write the formula. L represents the length of the rectangle Replace L with 7 W represents the width of the rectangle + Replace W with 4 1/2

Example 5-1a Find the perimeter of the rectangle. Follow Order of Operations P E MD AS Bring down P = Multiply 2  7 Bring down + Multiply 2  4 + Add 14 + 8 P = 14 + 8 P = P = 14 P = 14 + Add dimensional analysis P = 22 P = 22 m Answer: P = 22 meters 1/2

Example 5-1b Find the perimeter of a rectangle. Answer: P = 40.2 in. 1/2

Example 5-2a ARCHITECTURE The base of the Eiffel Tower is shaped like a square with 125-meter sides. What is the perimeter of the base? square 125-meter sides 125 m Draw a square Write dimensions 125 m 125 m Write formula for perimeter of a square Since perimeter is the distance around the figure and each side is equal, multiply 1 side by 4 125 m P = 4s P = 4(125) Replace s with 125 2/2

Example 5-2a 125 m Multiply 4  125 Add dimensional analysis 125 m 125 m 125 m P = 4s P = 4(125) P = 500 P = 500 m Answer: P = meters 2/2

Example 5-2b * ARCHITECTURE A new discount store is being built with its base in the shape of a square with 75-foot sides. What is the perimeter of the base? Answer: P = 300 ft 2/2

End of Lesson 5 Assignment

Perimeter Calculation for Rectangles and Squares

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