Circumference and Area of a Circle

Find the circumference of the circle.

• 15.54 cm

• 31.09 cm

• 62.17 cm

• 124.34 cm

What is labeled on the circle?

• Diameter

• Radius

How can you find the diameter if you are given the radius?

• Multiply by 2.

• Divide by 2.

What is the actual definition of this sign?

• It's the line going across the circle and going through the center

• It's the line going from the center to the edge of a circle

• It's the ratio of the circumference to the diameter of a circle.

• It's any line that goes through the circle but doesn't go through the middle.

What is the formula for finding the area of a circle?

• A = π·d

• C = 2·π·r

• A = π·r²

• C = π·d

What is the area of a circle?

• halfway through a circle

• a line through the center of a circle

• the amount of space inside of the circle

• the distance around a circle

What is the radius of a circle?

• halfway through a circle

• a line through the center of a circle

• the amount of space inside of the circle

• the distance around a circle

What is the area of a circle with a radius of 21 cm?

• 1384.74 cm²
• 2142.12 cm²
• 4348.08 cm²
• 1289.12 cm²

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

• 63.585 ft²
• 68.345 ft²
• 64.585 ft²
• 61.345 ft²

A cruise ship has a large, circular window. It has a diameter of 8 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 50.27 m²