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The radius is half the diameter. So multiply the radius by 2.

Q: What is the diameter of a circle if it has a radius of 4cm?

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4cm

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

radius is half the diameter. so 4cm.

The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)

The diameter of a circle is twice its radius

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radius=4cm diameter=8cm *radius is half the diameter

The radius is double the diameter so 4cm.

Diameter of circle = 2 * Radius of the circle.

4cm

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

you half the diamater to get the radius, then you square the radius. Then you times it by 3.14. Always. example. Diameter=4cm then radius =2cm squared=4cm 4x3.14=12.56

It is the diameter which is twice the radius giving a length of 8 cm

radius is half the diameter. so 4cm.

The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)

The diameter of a circle is twice its radius

Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm

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