Measure the diametre of the circle and divide by two to give the radius.
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A radius of a regular triangle is 12 . find the length of one side of the triangle?
The radius of the cylinder would be 0.64cm ! The radius is half the diameter - length has nothing to do with the question !
If the central angle is 70 and the radius is 8cm, how do you find out the chord lenght?
The length of the arc is r*theta where r is the radius and theta the angle subtended by the arc at the centre of the circle. If you do not know theta (or cannot derive it), you cannot find the length of the arc.
How to find the area of a fillet. Is it area =0.2146 radius squared