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tangent of pi/4 = 1
sin(pi/4) and cos(pi/4) are both the same. They both equal (√2)/2≈0.7071■
1/4 pi to find the degree in terms of pi, divide the degree by 180 in this example, 45 / 180 = 1/4
C = 2*pi*r 8 = 2*pi*r 4 = pi*r r = 4/pi
C = 2 pi r = 2 pi 4 = 6 pi = 18.84m