the raidus of a circle is the distance from the middle of a circle to any point.
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if you have a radius in a circle do you use A=(3.14)d2
circumference is pi times diameter (8.6 +8.6) x 3.1415926=___mm round off answer as needed
You draw a circle around a circle.
Its the distance from the center of the circle to the edge of the circle.
The cord of a circle that contains the center of that circle is a diameter of that circle.