Applied Mechanics and Graphic Statics
The centre of gravity of a triangle is at the point where three

Perpendicular bisectors of the sides of the triangle meet
Bisectors of the angle of the triangle meet
Medians of the triangle meet
None of these

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

At any point on the surface normal to the line of action of the force
On the periphery of the body
At the centre of gravity of the body
On any point on the line of action of the force

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