Converting radian into degree:
5π/12 radian = {(5π x 180)/(12 x π)}o = 75o
So, cos(5Ï€/12) is equivalent to cos75o and cos 75o = 0.92175126972.
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Tan(Pi/5) = √(5-2*√(5)) ~= 0.7265
Pi / 5 would be in Quadrant I.
7*pi/5 = 1.4*pi pi < 1.4*pi < 1.5*pi and so the angle is in the third quadrant.
pi*r squared*h pi*5 squared*12 pi*25*12 942!
Approx 44.4 degrees.