7 M3 L 16 - Circumference of a circle

What is the distance around a circle?

• Circumference
• Area
• Diameter
• Radius

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

The diameter of a circle is 10 in.

What is its radius?

• 20 in.

• 5 in.

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

• Multiply by 2.

• Divide by 2.

What is the diameter of the pictured circle?

• 4 cm

• 8 cm

• 12 cm

• 16 cm

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm

• 30 mm

• 25.3 mm

• 30.54 cm

Find the circumference of the circle.

• 75.36 yd

• 37.68 yd

• 18.84 yd

• 150.72 yd

There is a circle with a radius of 5. What is the circumference of the circle?

• 3.14

• 66.9

• 31.4

• 2.12

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft
• 12.25 ft
• 10.99 ft
• 8.75 ft