If you have the other two angles, you can subract them from 180 degrees, which is the sum of the angles in any triangle.
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If it is a scalene triangle then: 180 - the sum of the 2 known angles = x angle
A scalene triangle is a triangle in which all three sides have different lengths. The difference between a scalene right triangle and a scalene obtuse triangle is that in the first one, we can find the measure length of the third side when we know the lengths of the two other sides, and in the second one we cannot.
Measure it or use trigonometry if the 'included' angle is given.
You don't. It takes more than one side and one angle to determine a triangle. If you have two sides and the angle between them, or one side and two angles, you can do it.
The sum of the three angles of a triangle will always be 180 degrees. So to find the third angle, one must take 180 - 35 - 77. The answer would be 68