Question

the sum of the measure of the interior angle of a triangle is equal to_____.
A. 90
B.180
C.270
D.360

Answer 1

So all 3 interior angles in a triangle add up to 180 >.< I don't actually know why, though >.<

@Elsa213

Answer 2

hint:
the sum S of internal angles of a polygon is given by the subsequent formula:
\[\Large S = \left( {n - 2} \right) \times 180\]
where n is the number of sides of our polygon. In our case we have a triangle, so, n=3

Answer 3

then, after a substitution, we get:
\[\Large S = \left( {n - 2} \right) \times 180 = \left( {3 - 2} \right) \times 180 = ...?\]

Answer 4

90 is the answer