Circumferences and Areas of Circles

If my circumference is 163.28ft, what is my radius?

• 52ft

• 26ft

• 3.14ft

• 163.28ft

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

A Circle has a diameter of 18 meters. What is the circumference of the circle? (Best Choice)

• 9π or about 28.26 m

• 18π or about 56.52 m

• 81π or about 254.34m

• 324π or about 1017.36 m

Find the circumference of the circle

• 21.98

• 153.86

• 43.96

• 615.44

What is the circumference of a circle with a radius of 21 cm?

• 131.9 cm

• 121.9 cm

• 111.9 cm

• 141.9 cm

A Circle has a radius of 4.  What is the area of the circle? (Best Choice) (note: units are squared)

• 4π or about 12.56

• 16π or about 50.24

• 2π or about 6.28

• 8π or about 25.12

What is the area of the circle? (Best Choice)

• 3π or about 9.42 in²

• 6π or about 18.84 in²

• 12π or about 37.68 in²

• 36π or about 113.04 in² 

What is the area of the circle? (Best Choice)

• 24π or about 75.36 in²

• 12π or about 37.68 in²

• 144π or about 452.16 in²

• 576π or about 1,808.64 in² 

Find the area of the circle

• 56.52

• 254.34

• 1017.36

• 113.04

Is the red line a radius or diameter of the circle?

• Radius

• Diameter