If working in radians, the cosine of one-quarter of pi is equal to the square root of 0.5. Squaring this gives 0.5, or exactly one-half.
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sin(pi/4) and cos(pi/4) are both the same. They both equal (√2)/2≈0.7071■
Area of a circle in square units = pi*radius2
It is the formula for finding the surface area of a sphere which is 4*pi*radius2
area = 225 pi = pi R squared/4 R = square root 900 = 30 in
tangent of pi/4 = 1