Properties of Circles

Circles in Depth

First Let's Review

Multiple Choice

What formula is this used for:
πr²

• Circumference 
• Area
• Surface Area
• Volume

Multiple Choice

What formula is this used for:
πd

• Area
• Circumference 
• Surface Area
• Volume 

Multiple Choice

Radius 6 cm
What is the diameter? 

• 36 cm
• 12 cm
• 6 cm
• 3 cm 

Multiple Choice

Diameter 32 inches
What is the radius?

• 16 inches
• 64 inches
• 96 inches
  96 inches
• 16 ft 

Multiple Choice

A bicycle tire has a diameter of 20 inches. How many inches is one full revolution of the wheel?  

• 31.4 in
• 1256 in
• 125.6 in
• 62.8 in

Multiple Choice

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

• Diameter
• Radius

Multiple Choice

Ms. Catall is using a compass to find her way out of the woods. The compass has a radius of 4 centimeters. What is the compass's area?

• 49.2 cm²
• 45.6 cm²
• 50.24 cm²
• 55.9 cm²

Multiple Choice

You Try #1 Find the circumference of a circle with a diameter of 9 yards.

In terms of pi

• $$3\pi$$  

• $$9\pi$$  

• $$18\pi$$  

• $$81\pi$$  

Multiple Choice

You Try #2 Find the circumference of a circle with a radius of 25.3 inches.

• $$25.3\pi$$  

• $$50.6\pi$$  

• $$640.09\pi$$  

• $$12.65\pi$$  

Multiple Choice

You Try #3 Find the area of a circle with a diameter of 14 yards.

• $$49\pi$$  

• $$28\pi$$  

• $$7\pi$$  

• $$14\pi$$