Question

In ADEF, mcD = 3x +5, mcE= 4x - 15, and m2F = 2x +10. Find the value of x?

Answer 1

We are to find the value of x in the angles of the given triangle.

3x + 5 + 4x - 15 + 2x + 10 = 180 (sum of interior angles in triangle)

3x + 4x + 2x + 5 + 10 - 15 = 180

9x + 0 = 180

9x = 180

x = 180/9

x = 20 degrees

The correct option is A ( x = 20)