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edited Aug 9, 2016 at 7:14

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For example, on Wikipedia, I am given the formula I = m/6(P.P+P.Q+Q.Q)$$I = (m/6)(P.P+P.Q+Q.Q) $$ to calculate the moment of inertia for a triangle with points origin, P$P$, and Q$Q$. If I were to have two triangles bound together on origin and P$P$ or Q$Q$, could I add the two moment of inertia together?

For example, on Wikipedia, I am given the formula I = m/6(P.P+P.Q+Q.Q) to calculate the moment of inertia for a triangle with points origin, P, and Q. If I were to have two triangles bound together on origin and P or Q, could I add the two moment of inertia together?

For example, on Wikipedia, I am given the formula $$I = (m/6)(P.P+P.Q+Q.Q) $$ to calculate the moment of inertia for a triangle with points origin, $P$, and $Q$. If I were to have two triangles bound together on origin and $P$ or $Q$, could I add the two moment of inertia together?