71 degrees
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n = 99 degrees compliment = n-18 also, compliment = 180-n therefore n-18 = 180-n 2n = 198 n = 99
Well, isn't that a happy little angle we have here! 99 degrees is an acute angle, which means it's less than 90 degrees. It's like a tiny slice of sunshine in the big sky of angles, just waiting to bring joy to your geometric world.
The sum of all four interior angles in a quadrilateral must be 360, so the answer would be: 360 - 54 - 25 - 99 = 182
If the sides are 10cm, 17cm and 21cm, the three angles are approx 28, 53 and 99 degrees. It is an obtuse angled triangle.
the answer to 180 degree angle is 72 degree angle.