Circumference, Area, and Volume

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 radius of this circle?
 $r=\frac{1}{2}d$  

• 18

• 10

• 9

• 8

What is the diameter?
 $d\ =\ 2r$  

• 5 in

• 10 in

• 3.14 in

• 15.84 in

Use one of the formulas below to find the circumference of the circle. Use 3.14 for  $\pi.$  

 $C=2\pi r$  
 $C=\pi d$  

• 3.14 cm 

• 37.7 cm

• 24 cm

• 68.4 cm

Use the formula below to find the area of the circle. 

Use the  $\pi$  button for pi.
 $A=\pi r^2$  

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Use the formula below to find the volume of the cylinder.
Use 3.14 for $\pi.$   
 $V=\pi r^2h$  

• 1178 ft³

• 4712 ft³

• 7069 ft³

• 3534 ft³

What is the volume? ______ cubic in

Volume of Rectangular Prism = lwh