API 551
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I suppose your talking about a triangle. The angles of a triangle add up to 180 degrees. So A + B + C = 180 If A is three times the size of B and if A is C + 16 degrees Then (3B) + B +(3B - 16) = 180 So, let's remove the brackets..... 3B + B + 3B - 16 = 180 Add the Bs and move the 16 to the other side of the equation... 7B = 180 + 16 7B = 196 B = 196 / 7 B = 28 So now we know B we can work out the other angles... A = 3B = 3 x 28 = 84 C = A - 16 = 84 - 16 = 68 A = 84 B = 28 C = 68 ----- Sum 180