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
(4p² - q²)/6
(p² - q²)/4

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Engineering Mechanics
Angle of friction is the

The ratio of minimum friction force to friction force acting when the body is in motion
The ratio of minimum friction force to the friction force acting when the body is just about to move
Angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction

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