Area and Circumference

What is the formula for area of a circle?

• A = π × r²

• A = 2 × π × r

• A = π × d

What is the formula for Circumference?

• C = π × r²

• C = π × d

What is the radius of this circle?

• 36 in

• 18 in

• 9 in
• 8 in

What is the diameter of this circle?

• 3.5 m
• 3 m
• 5 m
• 7 m

Find the area of the circle below.

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

What is the circumference of this circle ?

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

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 diameter of a circle?

• the distance around a circle

• the area of a circle

• halfway through a circle

• a line through the center of a circle

What number represents π?

• 31.4

• 4.13

• 3.14

• 34.1