exam Maths Puzzle Numerical Ability

Hello" i have a question. Two angles of a triangle are measured 52 and 89 degrees. How do i find the third angle. Thanks for your help. This question is not from my text book.

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Im very sorry i made a error on my last question the real question is how do you get k in this equation 6(k+2)+2(2k-5)=22 The width of a rectangular Piayground is 2x-5 feet, and the length is 3x+9 feet. Write a polynomial P(x) that the perimeter and then evaluate this perimeter polynomial if x is 4 feet.