Math  Triangles
posted by Venus on .
An isosceles triangle has an interior angle of 26 degrees. Which of the following is a possible degree measure for one of the other interior angles of the triangle?
a) 52 degrees
b) 64 degrees
c) 78 degrees
d) 104 degrees
e) 128 degrees

The answer should be c). The sum of angles for a triangle is 180 degrees. Since this is an isosceles triangle, it must have two equivalent angles. Therefore 18026 = 154 degrees. When we divide 154 by 2, we get 77 degrees. So the possible degree measure is 78.