Understanding Radius
A worksheet to help third-grade students understand and identify the radius of a circle.
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Understanding Radius
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Read each question carefully and answer to the best of your ability. Pay close attention to the diagrams.
What is a Radius?
The radius of a circle is the distance from the center of the circle to any point on its edge. Imagine you are drawing a circle with a compass. The distance you set your compass to is the radius!
Look at the circle above. The red line shows the radius. It goes from the center of the circle to the edge.
1. Which of these describes a radius?
A line across the whole circle
A line from the center to the edge
A line outside the circle
A line that forms a square
2. Look at the circle below. Which line segment is the radius?
Line A
Line B
Line C
None of the above
3. The radius is the distance from the of the circle to its .
4. All radii in the same circle are in length.
5. Draw a circle and label its center and one radius.
6. A radius goes all the way across the circle.
True
False
7. The radius of a circle can be different lengths from the same center point.
True
False
Match the term to its definition.
8. Center
a. The distance from the center to the edge of a circle
9. Circle
b. The middle point of a circle
10. Radius
c. A round shape where all points on the edge are the same distance from the center