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Q: When given the radius of a circle how do you find the diameter?

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Double the radius

Divide the diameter by 2.

The radius of a circle is half of the diameter! So, if the diameter was four inches, the radius would be two inches!

Diameter of a circle = 2*radius Circumference of a circle = 2*radius*pi

The longest chord in a circle is its diameter and halve of this is its radius.

you cant: pi is the same for any circle - 3.1415... the diamter or the radius has to be given diameter divided by two equals the radius the radius times two equals the diameter

well, the radius is half of the diameter, so if i were you id divide by two

Area of a circle = pi*radius2 Radius = diameter/2

circumference of a circle = 2*pi*radius or pi*diameter

the radius is half the diameter

Radius is one-half of the diameter of a circle. Therefore, the radius of an eight-inch diameter circle is four inches. The diameter of a circle is a straight line joining a point on the circumference through the centre to the 'opposite' point on the circumference.

If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)

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