Answer:
2 is true
Explanation:
SInce the angles of a triangle add up to 180 c is equal to 50 because 100+30=130 and 180-130=50
By the Converse of the Base Angles Theorem or the Isosceles Triangle theorem if 2 angles of a triangle are congruent then the sides opposite are also congruent. By the definition of an isosceles triangle if a triangle has 2 equal sides it is isosceles.