How to solve isosceles triangle problems: property, examples, and their solutions.
An isosceles triangle has
two congruent sides (legs)
and two congruent angles.
Leg: two congruent sides
Base: side that is adjacent to the congruent angles
The given triangle is an isosceles triangle.
So the given angles are congruent.
So 3x + 25 = 55.
The right triangle is an isosceles triangle.
So the measure of the left blue angle is 70.
The left blue angle is
the exterior angle of the left isosceles triangle.
So x + x = 70.