Circles

Circumference of Circles

100

What is the circumference of a circle with a radius of 8in?

50.24in

200

What is the circumference of a circle with a diameter of 12mm?

37.68mm

300

Kayla wants to put a circular pool in her backyard. The diameter of the pool is 24ft. What is the length in feet, around the edge of the pool?

75.36ft 

400

Find the circumference of a circle with a radius of 24.5in

439.6in

500

Find the circumference of a circle with a radius of 24.5in. 

153.86in 

Area of Circles

100

Find the area of a circle with a diameter of 20 meters: 

314m²

200

Find the area of a circle with a radius of 15mm:

706.5mm²

300

 Find the area of a circle with a radius of 7in:

153.86in²

400

What is the area of a circle with a diameter of 10in?

78.5in²

500

Find the area of a circle with a radius of 2.5in

19.63in²

Mix it Up

100

Find the circumference of a circle with a radius of 27mm?

169.56mm

200

What is the area of a circle with a radius of 9ft?

254.34ft²

300

Find the area of a circle with a radius of 16mm:

803.84mm²

400

Find the area of a circle with a radius of 17mm:

907.46mm²

500

Find the circumference of a circle with a radius of 16in:

100.48in

(Blank)

100

What is the formula for calculating the area of a circle?

A=3.14xRxR of 3.14xR²

200

What formula do I use to calculate circumference when I am given a radius?

C=2x3.14xR

300

What formula do I use to calculate circumference when I am given a diameter?

C=3.14xD

400

What is the value of pi? 

3.14

500

The radius is ______ of the diameter

HALF