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

Q: If the radius of a circle is r what is the diameter of the circle?

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the radius of a circle is r

The radius of a circle with diameter or 8 inches is 4 inches. The diameter equals 2 times the radius or d=2*r. --> 8 in = 2*r so, r = 4 in

d = 2r, where d is diameter and r is radius.

72, double the radius because radius is half of the whole diameter.

When d=diameter and r=radius d=2r or r=1/2d

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R = Radius The radius is half the diameter of a circle.

the radius of a circle is r

The diameter of a circle is twice its radius (d = r x 2).

Very easy. The diameter of a circle is twice the radius, so: diameter = r x 2

Area of a circle = pi*radius2 Circumference of a circle = 2*pi*radius or diameter*pi Diameter of a circle = 2*radius

Diameter =2R(whare R-Radius of the circle)

The radius of a circle with diameter or 8 inches is 4 inches. The diameter equals 2 times the radius or d=2*r. --> 8 in = 2*r so, r = 4 in

the diameter is the length across the circle, the area is pie r squared r is radius, which is half of the diameter

d = 2r, where d is diameter and r is radius.

The radius is half the diameter. The diameter is twice the radius. If the radius is 10 inches, the diameter is twice that, or 20 inches. The radius is any straight line that connects a point on the circle with it's center. The diameter is a line segment that connects two points on a cirle throught the center of the circle.Answer:Let r be the radius of the circle and d be the diameter of the circle. We know that the diameter = 2 * radius of the circle. Given the radius r = 10 inches. Diameter d = 2 * 10 Diameter = 20 inches.

R (radius) X2. The radius is half the circle from the center of the circle. The diameter is just straight across.

r = 6.75'