Circumference and Area of Circles

What is the formula for area of a circle?

• A = π×r²
• A = 2×π×r

What is the formula for Circumference?

• C = π×r²
• C = 2×π×r

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

Find the area of the circle

• 56.52 in²
• 254.34 in²
• 1017.36 in²
• 113.04 in²

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 square in
• None of the above

Daniel wants to buy cookies for his friend. The
radius of a cookie is 5 inches. What is the cookie’s 
circumference?

• 10 in
• 2.5 in
• 15.7 in
• 31.4 in 

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

• 31.25 m²
• 29.55 m²
• 30.36 m²
• 28.26 m²