Circle Basics
Radius and Diameter
100

What is the name of the point at the exact center of a circle?

center

100

If the radius of a circle is 4 cm, what is the diameter?

8cm

200

What is the name of the distance from the center of the circle to the edge?

radius

200

If the diameter of a circle is 10 inches, what is the radius?

5 inches

300

What is the longest straight line that can be drawn across a circle, passing through the center?

diameter

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