Answer:
A. Isosceles
Explanation:
Since two angles are congruent, then the opposite sides are congruent. The two congruent angles measure 70 and 70.
70 + 70 = 140
180 - 140 = 40
The third angle measures 40. The third side is not congruent to the other two, so the triangle is isosceles but not equilateral.