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The radius of a circle is a line that starts at the center of the circle and ends somewhere along the perimeter of the circle. The diameter is a line that starts at the perimeter of a circle, goes through the center of the circle, and ends at the opposite perimeter of the circle. This a diameter is twice as long as a radius and can be thought or as consisting of two radii.
Hey,Yes and no.A chord is any straight line that starts and ends on the circle. If a chord goes through the center of the circle then it is a diameter.Hope this helps,Toby
It is the circle's diameter
If a chord goes thru the center of a circle, it is the diameter
The line that goes around, or envelopes, a circle is the circumference of the circle. It is found by multiplying the diameter of the circle, which is a line that crosses the center, by pi.