It is 180-2 known angles = unknown angle
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A bit more information:
Note: all angles of a triangle add up to 180 degrees. Therefore, if you know the sum of two angles, simply make up to 180 degrees.
25 degrees
The third angle is 34.5 degrees
180o - 100o - 40o= 40o=====
If it's a triangle then the 3rd angle is 35 degrees
That depends on the sizes of the other 2 angles if it's a right angle triangle then the other acute angle would be 70 degrees.
The third angle measures 18 degrees.
105
45 degrees.
25 degrees
The third angle is 34.5 degrees
70
180o - 100o - 40o= 40o=====
The other acute angle in that triangle is 40 degrees.
45 degrees
If it's a triangle then the 3rd angle is 35 degrees
That depends on the sizes of the other 2 angles if it's a right angle triangle then the other acute angle would be 70 degrees.
The 3rd angle is: 180-92-45 = 43 degrees