Left triangle.
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180 Two angles are 45 degrees and between them the third angle is 90 degrees.
You mean, "N in 45 degrees"? Ans. sine(45) = 0.7071 N
an equilateral triangle
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45 + 3n = -45 Subtract 45 from both sides: 3n = -90 Divide both sides by 3: n = -30