The 3rd angle is: 180-55-80 = 45 degrees
110
110
63
...a right triangle.
In any triangle exterior angle plus interior angles = 180 degrees
Each base angle is 62.5 degrees
A right angle triangle.
The missing angle measure is 100 degrees.
63
...a right triangle.
96˚all angles to a triangle equals 180˚
Since the sum of the measures of the angles in a triangle is 180°, and a right angle has a measure of 90°, it follows that the other two angles together have a measure of 90°.
The other acute angle in that triangle is 40 degrees.
77. The sum of the three angles in a triangle equal the sum of 180 degrees
two opposite interior angles.
The vertex angle of an isosceles triangle is equal to the measure of each of its base angles. Therefore, if one of the base angles measures 42 degrees, then the vertex angle also measures 42 degrees.
Let the second angle of the triangle be A. Then angle 1 = 2A : and angle 3 = 3A - 12 The internal angles of a triangle total 180° therefore :- 2A + A + (3A - 12) = 180 6A - 12 = 180 : 6A = 192 : A = 32 The angles measure 64° , 32° and 84° .
If the angles A, B and C forms a triangle, then angle A is 111 degrees.
In any triangle exterior angle plus interior angles = 180 degrees