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Angle of repose is equal to angle of friction.
a right angle is half of a straight angle
The relation between the arc of length and the central angle is that the arc of length divided by one of the sides is the central angle in radians. If the arc is a full circle, then the central angle is 2pi radians or 360 degrees.
what is the genreal relation between the amount of radiation recieved in each 30 degree degment and the angle of the sun's rays
720°