"Get out of the blast radius!", "We need to setup checkpoints on a 10 mile radius...", "What's the bite radius?"... You might have heard the term “radius” referenced in different movies. Who would have thought geometry also had a role in Hollywood too? Are you confident with your geometry skills? Do you think you can "figure" out our "radius" quizzes?

Yes, in circles, it's that line segment from the center to the perimeter. Are you still with us? If you answered "yes", then can you solve for the radius given different scenarios? How do you find the radius given the circumference of a circle? What about if the area is given? If these questions aren't making your mind go in circles, then you're the one for this job! It’s your time to shine. Prove that you're in tip top shape to answer our "radius" quizzes!

Students will find the radius, given the diameter, the diameter, given the radius, and the circumference, given either the radius or the diameter. Students will also identify radii, diameters, centerpoints, chords, and arcs of...

Questions: 15 | Attempts: 68 | Last updated: Nov 9, 2017

You must be able to change the diameter to a radius in order to find the area of a circle. Practice that skill now. Remember that inorder to change a radius to a diameter you MULTIPLY by 2. To change a diameter...

Questions: 5 | Attempts: 466 | Last updated: Jan 22, 2013

Sample Question

A circle has a radius of 10 cm, what is the diameter of the circle?