There is no equivalence. An angle is a measure of rotational displacement. It is formed by two rays (or lines) and does not create an enclosed space. An area is a measure of an enclosed space.
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Simply work out the area of a section of cable.........
by calculating I=1/12bh3
Imagine the wire is straight, now cut through at right angle to the centre line, the exposed surface is the cross sectional area, on a round wire it = pi * radius2 (area of a circle)
Oh, dude, calculating the cross-sectional area of a cube is like a walk in the park. You just take the length of one side of the cube and square it. So if the side of the cube is 4 units long, the cross-sectional area would be 16 square units. Easy peasy, right?
Perimeter of the base of the ruler multiplied by its height