Question

In a certain triangle, one angle has a measure of 55° and another angle has a measure of 70°. If the triangle is

isosceles, then which of the following could be the measure of the third angle?

A. 60
B. 55
C. 63

Answer 1

B) 55°

Explanation:

if it's an isosceles triangle then the third angle must be either 55° or 70°

and it cannot be 70 because 70+70+55 = 195° and a triangle only has 180°

Answer 2

B) 55°

Explanation:

55+70=125

180-125=55

or

Isosceles means 2 angles are the same, so it's 55°.