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yes, angle of friction is equal to angle of repose.
A congruent angle can also mean equal angle. So there is no set measurement of a congruent angle. Just the same as the angle it is equal to.
Not exactly.A ray that divides an angle into two angles of equal measure is called an angle bisector.
45o
All angles in a triangle must equal 180, therefore 180 - 120 = 60