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Find the interior angles of the triangle with vertices A = (1,5), B = (3,-1) and C = (-1,-1).

Sagot :

The sum of the interior angles of a triangle are equal to 180o. To find the third angle of a triangle when the other two angles are known subtract the number of degrees in the other two angles from 180o.Example: How many degrees are in the third angle of a triange whose other two angles are 40o and 65o? Answer: 180o - 40o -65o = 75o