Two angles of a triangle each measure 70°. What is the measure of the third angle in degrees?
We'll begin by recalling the fact that the sum of the angles of triangle is of 180 degrees.
Since the two angles of triangle measure each 70 degrees, then we'll get:
70 + 70 + x = 180
140 + x = 180
x = 180 - 140
x = 40 degrees
The third angle of the isosceles triangle is x = 40 degrees.