Angle Measurement

π radians  =  180^o
Remember π is a number 3.14... and as long as we divide both sides
of an equation by the same number the validity of the equation has not changed.
π/π radians   =  180^o/π
1 radian   =  180^o/π  = 57.2957...^o
Since the latter number is irrational we use   180^o/π to convert from radians to degrees.
1.3(1 radian)   = 1.3(180^o/π) = 74.48451...^o

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