Circles Review

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 formula for finding the area of a circle?

• A = π·d

• C = 2·π·r

• A = π·r²

• C = π·d

Tags

CCSS.7.G.B.4

What is the formula for circumference of a circle?

• C = π r
• C = π d
• C = 2 π d

Tags

CCSS.7.G.B.4

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

Tags

CCSS.7.G.B.4

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

• 3 m 
• 9.42 m
• 12 m
• 18.85 m

Tags

CCSS.7.G.B.4

What is the radius of this circle?

• 12cm
• 6cm
• 24cm
• 3cm

Tags

CCSS.7.G.B.4

A circle has a radius of 23 feet. What is the diameter of the circle?

• 23 feet

• 46 feet

• 1/2 feet

• 11.5 feet

Tags

CCSS.7.G.B.4

find the area of the circle with radius 3 cm below.

• 113.1 cm²

• 18.8 cm²

• 9.4 cm²

• 28.27 cm²

Tags

CCSS.7.G.B.4

What does r represent in the formula:

A = π·r²

• circumference

• radius

• diameter

• squared

Tags

CCSS.7.G.B.4