8.1 Practice

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

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 number represents π?

• 31.4

• 4.13

• 3.14

• 34.1

What is the circumference 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 is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

A circle has a diameter of 37. What is the circumference?

• 232.36

• 3.14

• 116.18

• 119.69

The diameter of a truck wheel is 56.5 inches. What is the circumference of the wheel?

• 177.49 inches
• 167.41 inches
• 157.41 inches
• 187.41 inches

What is the circumference of a circle with a radius of 33 ft?

• 207.2 ft
• 197.2 ft
• 217.2 ft
• 227.2 ft

What is the perimeter of the semi-circle?

• 49.7 cm

• 30.8 cm

• 37.7 cm

• 26.8 cm