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The length of the radius of a circle is what the length of its diameter.
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Remember, the radius of a circle is the straight line that joins the point at the center to any point on the circumference of the circle.
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So, if we take a circle whose center is ๐, we could have a radius here.
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And what about the diameter?
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Well, the diameter also passes through the center of the circle.
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But this time, itโs a straight line that joins two points on the circumference.
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So, the diameter of this circle is this line here.
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But of course, If we look carefully at the diameter, we can see that we can make up of one, two radii.
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And so, this means that a diameter of the circle must be twice or double the length of the radius.
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And in turn, we can say that the radius of the circle must therefore be half the length of its diameter.