Question

Each angle of a quadrilateral is x + 5°. Find the value of x.

Answer 1

We know that the sum of interior angles of a quadrilateral is 360o.

∠A + ∠B + ∠C + ∠D = 360o

x + 5o + x + 5o + x + 5o + x + 5o = 360o

4x + 20o = 360o

4x = 360o - 20o

4x = 340o

x = 340o/4 = 85o