Supplementary angles are angles whose sums =180 degrees.
You have a 65 degree angle + it's supplementary angle = 180 degrees.
So, to find the supplementary angle, subtract 65 from 180.
180 - 65 = supplementary angle.
115 = supplementary angle.
To check, add the angles together. 65 + 115 = 180 (check)
(Also, you might be working with complimentary angles.
Complimentary angles are angles whose sum = 90 degrees.)
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A pair of supplementary angles add up to 180 degrees. Therefore, the supplement to a 105 degree angle is equal to 180 - 105 = 75 degrees.
Yes. The fourth angle is 115 degrees.
Cos(65 deg) = 0.4226 approx.
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45 degree angle