cot 15 = cot(45 - 30)
= cot45.cot30 - 1 / cot45 + cot 30
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The half angle formula is used to calculate chord length in circles. This is particularly helpful in complex construction projects involving curves. It's not like you'll be doing this if you're in marketing, selling insurance, or are holding down the sous-chef de cuisine slot at a five star hotel. But it's real enough to those who work with this in engineering.
180 degrees, if you mean a half circle
a parelelogram
A right angle is 90 degrees. If you split it in half perfectly, each resulant angle would then be 45 degrees. (90/2). Source- 12 years of math.
John Stith Pemberton