8.1-8.3 Review

What is the radius of this circle?

• 18 in
• 10 in
• 9 in
• 8 in

What is the diameter of this circle?

• 3.5 m
• 3 m
• 5 m
• 7 m

What is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

Find the area of the circle below.

• 100 cm²
• 225 cm²
• 9 cm²
• 28.26 cm²

What is the area of this composite shape?

• 14 in²
• 68 in²
• 36 in²
• 24 in²

_{Find the area.}

• 28 square cm
• 36 square cm
• 40 square cm
• 36 square feet

Find the area of the composite figure

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 two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²