Circumference and Radius

This 12-question quiz works through the parts of a circle and the formulas that connect them.

You will identify relationships and run calculations with items like What is the formula for finding the circumference of a circle? and The radius of a circle is 6 cm. What is the diameter?

The handle on all of it is the value of pi, roughly 3.14, which links a circle's distance around to the distance straight across.

Once you remember that the diameter is simply twice the radius, the rest of the formulas tend to fall into place.

Recommended level: intermediate.

0 of 12 answered Score: 0%

Question 1

The diameter of a circle is 28 feet. What is the radius?

🔒 Answer question 1 to unlock

A circle with diameter is 15 cm has a circumference of 47.1 cm.

🔒 Answer question 2 to unlock

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

🔒 Answer question 3 to unlock

The radius of a circle is 4 m. What is the circumference?

🔒 Answer question 4 to unlock

The radius is longer than the diameter.

🔒 Answer question 5 to unlock

Pi has a value of approximately ___.

🔒 Answer question 6 to unlock

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

🔒 Answer question 7 to unlock

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

🔒 Answer question 8 to unlock

The diameter of a circle is 18 inches. What is the circumference?

🔒 Answer question 9 to unlock

The radius of a circle is 6 cm. What is the diameter?

🔒 Answer question 10 to unlock

The diameter of a circle is twice as long as the radius.

🔒 Answer question 11 to unlock

The ___ is the distance around a circle.

correct answers

Nice work, but this score isn’t saved yet.

Create a free account and we’ll keep it, and track how well you do from here.

Continue with Google Sign up with email

Already have an account?

Want a guided path through Geometry?

Create a Study Plan