Report

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? So, if one of this polygon’s sides measures 5 cm... A regular polygon is one in which all sides are the same length. …what would the perimeter of this polygon be? Let’s find the perimeter. 5 cm 5 cm 5 cm 5 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 = width 2 x length + 2 x width = 2l + 2w = length width 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 = 2x7+2x5= 5 mm 14 + 10 = 7 mm 5 mm Find the Perimeter 10 ft 2l + 2w = 8 ft 2 x 10 + 2 x 8 = 0 20 + 16 = 10 ft 8 ft Find the Perimeter 3 in 2l + 2w = 2x7+2x3= 14 + 6 = 7 in ??? ??? Rectangle Perimeter Formula 2 in 2l + 2w = perimeter of a rectangle 2 x length + 2 x width 2l + 2w = 6 in 2x6+2x2= 12 + 2 x 2 = 12 + 4 = Find the Perimeter Use: 2l + 2w = perimeter of a rectangle 10 yds 1 yds Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply first. Step 4: Add last. Step 5: Write the answer with the correct units. 2l + 2w = 2 x 10 + 2 x 1 = 20 + 2 = 20 + 2 = 22 22 yds Find the Perimeter Use: 2l + 2w = perimeter of a rectangle 9 in 3 in Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply first. Step 4: Add last. Step 5: Write the answer with the correct units. 2l + 2w = 2x9+2x3= 18 + 6 = 18 + 6 = 24 24 in Try one with someone at your table. Use: 2l + 2w = perimeter of a rectangle 4 cm 8 cm Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply first. Step 4: Add last. Step 5: Write the answer with the correct units. 2l + 2w = 2x8+2x4= 16 + 8 = 16 + 8 = 24 24 cm 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 side side 4s = So, how would you find the perimeter of this square? 7 mm 4s = 4x7= 7 mm 7 mm 7 mm So, how would you find the perimeter of this square? 4s = 5 ft 5 ft 4x5= 5 ft 5 ft Square Perimeter Formula 4s = perimeter of a square 3 in 4 x side 4s = 4x3= Find the Perimeter Use: 4s = perimeter of a square 10 yds Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply and write the correct units in your answer. 4s = 4 x 10 = 4 x 10 = 40 yds Find the Perimeter Use: 4s = perimeter of a square 9 cm Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply and write the correct units in your answer. 4s = 4x9= 4x9= 36 cm Try one with someone at your table. Use: 4s = perimeter of a square 6 mm Step 1: Write the formula. Step 2: Replace the variables. Step 3: Multiply and write the correct units in your answer. 4s = 4x6= 4x6= 24 mm Let’s Review What does perimeter mean? •Perimeter is the distance around the edge of an object. What is the formula for finding the perimeter of a rectangle? What is the formula for finding the perimeter of a square? Now it is your turn.