Question

Find x.
In given figure. ​

Answer 1

Angle a + angle b + angle c = 180°

40 + angle b + 90 = 180

Angle b + 130 = 180

Angle b = 180 – 130

Angle b = 50

Angle b + angle e + x = 180

50 + 100 + x = 180

150 + x = 180

x = 180 – 150

X = 30°