Engineering Mechanics
The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is

[√(4p² - q²)]/6
(p² - q²)/4
(p² + q²)/4
(4p² - q²)/6

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point but their lines of action lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
None of these

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