proof that the torque of  a triangle area with respect to its (fixed) base as axis of rotation depends solely on its altitude and not on the shape. As a consequence all triangles with a common side and equal area generate an identical torque with respect to the common side.
<a href="//commons.wikimedia.org/wiki/User:Kmhkmh" title="User:Kmhkmh">Kmhkmh</a>
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