Understand Perimeter
Match the shape to its perimeter.
*Look at side board
A) 26 units B) 27 units
C) 28 units D) 30 units
D) 30 units
Match the rectangle to its perimeter.
*Look at side board
A) 20 in B) 22 in C) 24 in D) 26 in
C) 24 in
Find the length of the unknown side.
*Look at side board
15 cm
A rectangle has a perimeter of 14 centimeters. Each side is a whole number of centimeters. What are the possible areas for the rectangle?
Select all that apply.
A) 6 square cm B) 8 square cm
C) 10 square cm D) 12 square cm
A) 6 square cm
C) 10 square cm
D) 12 square cm
Which two rectangles have the same area?
*Look at side board
B and C
Match the shape to its perimeter.
*Look at side board
A) 26 units B) 27 units
C) 28 units D) 30 units
C) 28 units
Match the rectangle to its perimeter.
*Look at side board
A) 20 in B) 22 in C) 24 in D) 26 in
B) 22 in
The regular octagon has a perimeter of 48 inches. What is the length of each side?
_____ in
6 in
A square has a perimeter of 36 meters. What is its area?
A) 36 square m B) 70 square m
C) 80 square m D) 81 square m
D) 81 square m
Which two rectangles have the same perimeter?
*Look at side board
A and B
What is the perimeter of the figure?
*Look at side board
_____ units
30 units
Each side of a regular hexagon is 5 feet long. What is the perimeter?
_____ feet
30 feet
The perimeter of the quadrilateral is 21 feet. What is the unknown side length?
*Look at side board
A) 5 ft B) 6 cm C) 7 ft D) 8 ft
C) 7 ft
The perimeter of a square painting is 12 inches. What is the area of the painting?
9 in2
Which has the greatest perimeter?
*Look at side board
A
A polygon has four sides that are 2 units long, two sides that are 5 units long, one side that is 7 units long, and one side that is 3 units long. What is the perimeter of the polygon?
______ units
28 units
Find the perimeter.
*Look at side board
_____cm
17 cm
The perimeter of the rectangle is 18 cm. What is the unknown side length?
*Look at side board
A) 3 cm B) 6 cm C) 9 cm D) 15 cm
B) 6 cm
A square garden has a perimeter of 28 meters. What is the area of the garden?
49 m2
A rectangle is 4 inches long and 2 inches wide. Trina says that if she doubles the length and the width, the perimeter will also be doubled. Is she correct? Explain.
Trina is correct; The perimeter is 4+4+2+2=12 inches. If she doubles the side lengths, the perimeter is 8+8+4+4=24 inches.
Shade small squares to make a polygon that has at least 6 sides and a perimeter of 12 units.
*Look at side board
Answers may vary
The floor of a rectangular room is 30 feet long and 20 feet wide. What is the perimeter of the room?
A) 50 ft B) 80 ft C) 100 ft D) 120 ft
C) 100 ft
One side of a regular pentagon is 20 cm long. Mike uses addition to find its perimeter. David uses multiplication to find its perimeter. Show the work each boy did.
Mike: 20+20+20+20+20=100 cm
David: 20x5=100 cm
Jen, Sue, and Wendy each draw a rectangle with a perimeter of 24 centimeters. The length of Jen’s rectangle is 11 centimeters. The length of Sue’s rectangle is 8 centimeters. Wendy’s rectangle is a square.
Part A What are the length and width of each rectangle?
Jen’s rectangle: __ cm and __ cm
Sue’s rectangle: __ cm and __ cm
Wendy’s rectangle: __ cm and __ cm
Part B Whose rectangle has the greatest area? Whose rectangle has the least area?
Part A
J: 11 cm and 1 cm
S: 8 cm and 4 cm
W: 6 cm and 6 cm
Part B
Wendy's rectangle has the greatest area. Jen's has the least.
A parallelogram has a perimeter of 30 centimeters. Do you have enough information to find the length of each side? Explain your answer
No; The opposite sides of a parallelogram are the same length, but all four sides so not have to be the same length.