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Perimeter. What does it mean?. Let’s find the perimeter. 12 ft. 8 ft. 10 ft. Let’s find the perimeter. 15 in. 20 in. 20 in. 10 in. Let’s find the perimeter. This is a regular polygon. What is a regular polygon?. A regular polygon is one in which all sides are the same length.

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## Perimeter

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**Perimeter**What does it mean?**Let’s find the perimeter.**12 ft 8 ft 10 ft**Let’s find the perimeter.**15 in 20 in 20 in 10 in**Let’s find the perimeter.**This is a regular polygon. What is a regular polygon? A regular polygon is one in which all sides are the same length. So, if one of this polygon’s sides measures 5 cm... …what would the perimeter of this polygon be?**Let’s find the perimeter.**5 cm 5 cm 5 cm 5 cm 50 cm 5 cm 5 cm 5 cm 5 cm 5 cm 5 cm**So, how would you find the perimeter of this rectangle?**length ???**So, how would you find the perimeter of this rectangle?**length ??? width length**So, how would you find the perimeter of this rectangle?**length width width length**So, how would you find the perimeter of this rectangle?**length length + length + width + width = 2 x length + 2 x width = width width 2l + 2w = length**So, how would you find the perimeter of this rectangle?**7 mm ???**So, how would you find the perimeter of this rectangle?**7 mm ??? 5 mm 7 mm**So, how would you find the perimeter of this rectangle?**7 mm 2l + 2w = 2 x 7 + 2 x 5 = 5 mm 5 mm 14 + 10 = 24 cm 7 mm**Find the Perimeter**10 ft 2l + 2w = 2 x 10 + 2 x 8 = 0 8 ft 8 ft 20 + 16 = 36 ft 10 ft**Find the Perimeter**3 in 2l + 2w = 2 x 7 + 2 x 3 = 14 + 6 = 20 in 7 in ??? ???**Rectangle Perimeter Formula**2 in 2l + 2w = perimeter of a rectangle 2 x length + 2 x width 2l + 2w = 6 in 2 x 6 + 2 x 2 = 12 + 2 x 2 = 16 in 12 + 4 =**Find the Perimeter**Use: 2l + 2w = perimeter of a rectangle 10 yds 1 yds 2l + 2w = Step 1: Write the formula. 2 x 10 + 2 x 1 = Step 2: Replace the variables. 20 + 2 = Step 3: Multiply first. 20 + 2 = 22 Step 4: Add last. 22 yds Step 5: Write the answer with the correct units.**Find the Perimeter**Use: 2l + 2w = perimeter of a rectangle 9 in 3 in 2l + 2w = Step 1: Write the formula. 2 x 9 + 2 x 3 = Step 2: Replace the variables. 18 + 6 = Step 3: Multiply first. 18 + 6 = 24 Step 4: Add last. 24 in Step 5: Write the answer with the correct units.**Try one with someone at your table.**Use: 2l + 2w = perimeter of a rectangle 4 cm 8 cm 2l + 2w = Step 1: Write the formula. 2 x 8 + 2 x 4 = Step 2: Replace the variables. 16 + 8 = Step 3: Multiply first. 16 + 8 = 24 Step 4: Add last. 24 cm Step 5: Write the answer with the correct units.**So, how would you find the perimeter of this square?**side side side side**So, how would you find the perimeter of this square?**side side + side + side + side = 4 x side = side 4s = side side**So, how would you find the perimeter of this square?**7 mm 4s = 4 x 7 = 28 mm 7 mm 7 mm 7 mm**So, how would you find the perimeter of this square?**4s = 5 ft 4 x 5 = 20 ft 5 ft 5 ft 5 ft**Square Perimeter Formula**4s = perimeter of a square 3 in 4 x side 4s = 12 in 4 x 3 =**Find the Perimeter**Use: 4s = perimeter of a square 10 yds 4s = Step 1: Write the formula. 4 x 10 = Step 2: Replace the variables. 40 yds 4 x 10 = Step 3: Multiply and write the correct units in your answer.**Find the Perimeter**Use: 4s = perimeter of a square 9 cm 4s = Step 1: Write the formula. 4 x 9 = Step 2: Replace the variables. 36 cm 4 x 9 = Step 3: Multiply and write the correct units in your answer.**Try one with someone at your table.**Use: 4s = perimeter of a square 6 mm 4s = Step 1: Write the formula. 4 x 6 = Step 2: Replace the variables. 24 mm 4 x 6 = Step 3: Multiply and write the correct units in your answer.**Let’s Review**• Perimeter is the distance around the edge of an object. What is the formula for finding the perimeter of a rectangle? What does perimeter mean? 2l + 2w What is the formula for finding the perimeter of a square? 4s

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