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The radius of any circle is the straight line distance from the centre of the circle to any point on the circumference of the circle.

The radius being 21 cm makes no difference to the definition of the radius; it just means that the straight line distance from the centre of that circle is 21cm away from any point on the circumference of that circle.

The radius of a circle with a radius of 21 cm is 21 cm.

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Q: If the radius of a circle is 21cm What is the radius?

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A = 1385cm2

A = 1,385.4 cm2

Radius of circle: 132/2pi = 21cm to the nearest integer

A circle with the radius of 21cm would have an area of approximately 1384.74 cm. You would find this by using the equation of pi*(radius^2) = pi*(21^2).

The approximate diameter of a circle whose circumference is 21cm is: 6.68cm

A = 346.36 cm2

area of a circle and the question is d=21cm

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 = the diameter of the circle divided by 2

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