Q: What is the radius if a 20mm circle?

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C = 2(3.14)(r) = 62.8 r = 10mm d = 20mm

the radius of a circle is r

The radius of a circle is half the circle's diameter

The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.

The diameter of a circle is twice its radius

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C = 2(3.14)(r) = 62.8 r = 10mm d = 20mm

40 millimeters

For a circle with a diameter of 20 mm, it's radius, which is half that, will be 10 mm. The area (A) of a circle is pi (about 3.1416) times the radius (r) squared (r2). Here's how we work it: Acircle = pi x r2 = 3.1416 x 102 = 3.1416 x 100 = 314.16 mm2

The radius of the circle.

the radius of a circle is r

The radius of a circle is half the circle's diameter

Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.

The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.

The radius of a circle is halve the circle's diameter.

The radius of a circle = the diameter of the circle divided by 2

It is the radius of the circle.

The diameter of a circle is twice its radius