The sum of the angles in a triangle is 180 degrees. Considering the given triangle, it means that
29 + 4x + 9 + x + 17 = 180
We would collect like terms. Thus, we have
4x + x + 29 + 9 + 17 = 180
5x + 55 = 180
5x = 180 - 55 = 125
x = 125/5
x = 25
5.6m questions
7.3m answers