Circles

Circles

Multiple Select

What are the two formulas for circumference?

•  $C=2\pi r$   
  

•  $C=\pi r^2$  

•  $C=\pi r$  

•  $C=\pi D$  

Multiple Choice

What is the formula for area?

• $A=\pi D$

• $A=\pi r$

• $A=\pi r^2$

Multiple Choice

What is the circumference of a circle with a radius of 4 cm? (Use 3.14 for pi.)

• 12.56 cm

• 25.12 cm

• 50.24 cm

Multiple Choice

What is the area of a circle with a diameter of 6 cm?

• 18.84 sq cm

• 113.04 sq cm

• 37.68 sq cm

• 28.26 sq cm