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| Area | Perimeter |
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| n is the number of sides. | |
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Use the Polar Moment of Inertia Equation for a triangle about the (x1, y1) axes where: 
Multiply this moment of inertia by n. This is the Polar Moment of Inertia of a Regular n sided Polygon about the Centroidal Axis. |
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 Moment of Inertia |
Geometric Properties |
