Radius Diameter Circumference Area of Circles

Find the area of this circle. Use 3.14 for pi. Only type the number.

Name all of the radii

• JC, KC, KH, HC

• JO, KO, CO, HO

• JC, KO, KH, HO

• JK, KC, CH, HJ

The radius of a circle is 5 cm. 3x+7 represents the length of the diameter. Write an equation for x.

• 3x+7=5

• 3x+7=10

• 3x+7=7

• 3x+7=2.5

Find the area of this circle. Use 3.14 for pi. Only type the number.

If my diameter is 90cm, what is my circumference?

• 282.6 cm

• 180 cm

• 90 cm

• 565.2 cm

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

If my diameter is 19 inches, what is my radius?

• 38 inches

• 9.5 inches

• 59.66 inches

• 119.32 inches

If my radius is 2 yd what is the circumference?

• 4 yd

• 1 yd

• 12.56 yd

• 6.28 yd

If my circumference is 50.24ft, what is my radius?

• 8 ft

• 16 ft

• 25.12 ft

• 50.24 ft

An electric fan has a diameter of 10 inches. Find the area of this fan.