Area, Perimeter, and Circumference

Area of a Triangle

A = bh/2

Area of a Rectangle

A = lw

Area of a Circle

A = πr²

551.27 cm²

A Susan B. Anthony dollar coin has a diameter of 26.50 cm. What is the area of the coin to the nearest hundredth?

66 ft

A circular swimming pool is 21 feet in diameter. What is the circumference of the swimming pool?

95 in²

A frying pan has a diameter of 11 in. What is the area to the nearest inch of the frying pan?

88 cm

A frying pan has a radius of 14 cm. What is the circumference of the frying pan?

132 cm

A jar lid has a diameter of 42 cm. What is the circumference of the lid?

44 in

A planter full of daisies has a diameter of 14 in. What is the circumference of the planter to the nearest inch?

31 in

A round stained-glass window has a circumference of 195 in. What is the radius of the window to the nearest inch?

114 cm²

A standard CD has a diameter of 12 cm. What is the area of a circular case that can be used to store the CD?

1,386 in²

A tablecloth for a round table has a radius of 21 in. What is the area of the tablecloth?

56.5 in

Basketball rims have a diameter of 18 in. If you want to put a band around the basketball rim, how much material to the nearest tenth of an inch will you need?

1200 ft²

Bob would like to paint the four walls in his room. All four walls are the same dimensions. The dimensions are 20 ft by 15 ft. How much square footage does he need to paint to cover all four walls?

Circumference of a circle

C= πd

46 ft

Cindy wants to fence the dog run in her back yard. The dimensions of the dog run are 15 ft by 8 ft. How much fencing does Cindy need?

50 cm

Find the CIRCUMFERENCE of a circle with a diameter of 16 cm. Round your answer to the nearest whole number.

79 cm²

Find the area of a circle with a diameter of 10 cm. Round your answer to the nearest whole number.

64 cm²

Find the area of a square with side length 8 cm.

60 cm²

Find the area of the Rectangle

35 cm²

Find the area of the triangle

28 ft

John is building a dog pen that is 6 feet by 8 feet. How many feet of fencing material will he need to go all the way around the pen?

552 ft

Mr. Marcos, the gym teacher, had the seventh graders run around the perimeter of the gym 3 times. The gym as a length of 34 feet and a width of 58 feet. What was the total distance the students ran?

75 cm

Sue wants to border a circular frame with ribbon. How much ribbon does she need to buy to go around a frame that has a radius of 12 inches? Round to the nearest whole number.

530.7 in²

What is the area of a circle with a radius of 13 in?

47.1 cm

What is the best estimate for the circumference of a circle with a diameter of 15 cm?