Area of Circles Given Radius or Diameter

What is the circumference?

• 36

• 18pi

• 108pi

• 36pi

Steven purchases a bowl. The diameter of the bowl is 14 cm. What is the circumference of the bowl?

• 28 cm

• 43.98 cm

• 87.96 cm

• 7 cm

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

• 10.5 ft

• 42 ft

• 65.97 ft

• 131.95 ft

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

What is the space that a circle covers called?

• Area

• Radius

• Circumference

• Diameter

How do you find the area of a circle?

What is the diameter of this circle?

• 6 m

• 6 cm

• 24 cm

• 24 m

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

• Radius

• Diameter

The diameter is ​ (a)   so the radius of the circle is ​ (b)  

• 8 inches

• 4 inches

• 16 inches

• 2 inches