Yr 8 Math Cycle 2 - Circle; Circumference Area

What is the distance around the outline of a circle called?

• Circumference

• Area

• Diameter

• Radius

The formula for the circumference of a circle is...

If the radius is 10 ft, what is the diameter?

• 20 ft

• 5 ft

• 31.4 ft

• 62.8 ft

What is the circumference of the circle in the diagram, correct to 1 decimal place?

• 3.1 cm

• 37.7 cm

• 24.0 cm

• 75.4 cm

If the Circumference of a circle is 37.7 mm, what is its Diameter?

• 9 mm

• 10 mm

• 12 mm

• 13 mm

What is the circumference of the circle in the diagram, correct to one decimal place?

• 50.3

• 96.2

• 24.1

• 18.8

What is the radius and the circumference to the nearest foot, for the circle in the diagram?

• 18 ft, 36 ft

• 36 ft, 13 ft

• 18 ft, 56 ft

• 18 ft, 113 ft

A circular swimming pool is 21 feet in diameter.

How many feet is the circumference around the pool, to the nearest foot?

• 11 ft

• 42 ft

• 66 ft

• 132 ft

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 ?

• 13 ft

• 12 ft

• 11 ft

• 9 ft

Daniel wants to buy cookies for his friend. The radius of a cookie is 2 inches. What is the cookie’s circumference, correct to the nearest inch?

• 10 in

• 4 in

• 16 in

• 13 in