calculate radius of crane:
The radius is always measured from the centre of rotation and is the radius measured after the boom deflects forward when under load.
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Radius of a circle = diameter/2
4cm
Calculating the radius of a semicircle depends on what information about the semicircle is given.
A radius of a sphere is the distance from its centre to its surface. It is also half of the diameter. If you know the circumference of a circle, you can calculate its radius. Circumference divided by Pi divided by 2 = radius.
a=3.14xradius squared