An angle of 315 degrees is a reflex angle
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a reflex angle
As 180° = a straight angle = π radians → to convert degrees to radians divide by 180° and multiply by π radians → 315° = 315° ÷ 180° × π radians = 7π/4 radians ≈ 5.50 radians.
Use the half angle form, which states that: sin(x/2) = √((1 - cos(x))/2) Then: x/2 = 157.5 x = 315 You should get: sin(315 / 2) = √((1 - cos(315))/2) = √((1 - 1/√2)/2)
There are 90 degrees in a right angle and 3.5*90 = 315 degrees
21% of 315= 21% * 315= 0.21 * 315= 66.15