A radius is a line segment that goes from the centre of a circle to the edge of the circle. It is the distance from the centre of the circle to any point on the circle.
For example, if you draw a circle on a piece of paper, you can measure the radius by drawing a line from the centre of the circle to any point on the circle. The distance between the two points is the radius.
The radius of the circle is 10 cm.
Noun:
The word "radius" comes from the Latin word "radius", which means "ray".
The first recorded use of the word "radius" in English was in the 14th century.
Why might it be useful to know the radius of a circle?
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