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
Medians of the triangle meet
None of these
Bisectors of the angle of the triangle meet

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

A couple can be never the balanced by a single force
Algebraic sum of forces, constituting a couple is zero
Algebraic sum of moments of forces, constituting a couple, about any point, is same
All listed here

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