Yes. The fourth angle is 115 degrees.
It is: 25*cosine(65) = 10.565 feet rounded
45 degree angle
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.)
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.
cosine(59 degrees) = 0.51504 (rounded)
60 degrees = 0.5 1/2
Cosine cannot have this kind of high value, it ranges from -1 to +1
at a 45 degree angle, or pi/4
45 degree
A 65 degree angle is acute.
Is 65 an acute angle
cos(50) = 0.6428 (rounded)
An acute angle
As a decimal: 0.866 As a fraction: √(3)/2
the completment of a 65 degree angle is 130
Yes. The fourth angle is 115 degrees.