Question

Two angles of a triangle are 45 degrees and 30 degree respectively. The third angle is it is 105 or 95 or 115

Answer 1

Answer:

From the formula: (n-2)x180, you get the sum of all internal angles on a given polygon, where n is the number of sides.

Since we’re talking about a triangle, from the name itself, “tri” means three, so if n=3, then the sum of all internal angles on a triangle is 180 degrees.

Therefore, if we know the amplitude of two out of the three angles inside a triangle we only need to subtract their amplitudes to 180 to obtain the amplitude of the third angle, like so:

180 - 35 - 45 = 100 degrees