What is the formula for moment of inertia for a circle?


Quick Answer

The formula for moment of inertia for a circle is the product of pi over four times the radius to the power of four. The area moment of inertia is also called the second moment of area.

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Full Answer

In mathematical notation, the moment of inertia is often symbolized by I, and the radius is symbolized by r. The formula for the moment of inertia of a ring created by two overlapping circles is similar. Multiply pi over four by the difference between both radii taken to the fourth power. The moment of inertia of part of a circle can be found by using the trigonometric function sine and the angle of the circle segment in question.

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