8-1 to 8-3 Review

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 formula for circumference of a circle given the diameter?

• C = pi x r
• C = pi x 2r
• C = pi x D
• C = pi x 2D

What is the diameter?

• 8
• 16
• 10
• 4

What is the circumference of this circle?

• 3.14 cm 
• 37.7 cm
• 24 cm
• 68.4 cm

Find the circumference of a circle with a radius of 12.5 mm.

• 37.68mm
• 18.84mm
• 78.54mm
• none of the above

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.1

What is the formula for area of a circle given the radius?

• A = πr
• A = 2πr
• A = πd
• A = πr²

What is the area?

• 108 cm sq
• 60 cm
• 432 cm sq
• 216 cm sq