Circumference and Area of Circles

The homeowners association wants to enclose the playground in a fence. How much fencing is needed?
Is this question finding the area or the circumference?

• area

• circumference

• neither

What is the radius of this circle?

• 18 in

• 36 in

• 9 in

What is the perimeter of this semi circle?

• 3.6π m

• 7.2π m

• 14.4π

• 12.96π

Find the circumference of a circle that has a radius of 3ft.

• about 18.84 ft.

• about 10 ft

• about 9 ft

• about 16.26 ft

What is the circumference of a circle with a radius of 12.7 m? 

• 79.76 m

• 80.34 m

• 14.56 m

• 80.00 m

A car wheel has a diameter of 75 cm. What is the circumference of the wheel?

• 235.5 cm

• 245.5 cm

• 215.5 cm

• 225.5 cm

find the area of the circle with radius 3 cm below.

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Find the radius of a circle that has a diameter of 60mm.

• 120mm

• 60mm

• 30mm

• 15mm

Find the perimeter of the figure.  Use 3.14 for pi.

• 20.56 in.

• 17.3 in.

• 17.8 in.

• 31.88 in.

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd