Circumference and Area

The distance halfway across the circle is called the...

• radius

• diameter

• circumference

• area

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

• Radius

• Diameter

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

• Radius
• Diameter

What is the radius of this circle?

• 18
• 36
• 9
• 6

What is the diameter of this circle?

• 3.5
• 6.5
• 6
• 7

Find the circumference of the circle

• 21.98
• 153.86
• 43.96
• 615.44

The radius is 8 inches.  What is the circumference?

• 50.24 inches
• 25.12 inches
• 12.56 inches
• 200.96 inches

A Circle has a radius of 4.  What is the area of the circle? (Best Choice) (note: units are squared)

• 4π or about 12.56
• 16π or about 50.24
• 2π or about 6.28
• 8π or about 25.12

A Circle has a radius of 6 inches.  What is the area of the circle? (Best Choice)

• 3π or about 9.42 in²
• 6π or about 18.84 in²
• 12π or about 37.68 in²
• 36π or about 113.04 in² 

A Circle has a radius of 12 inches.  What is the area of the circle? (Best Choice)

• 24π or about 75.36 in²
• 12π or about 37.68 in²
• 144π or about 452.16 in²
• 576π or about 1,808.64 in²