Find the value of x.
A
160°
B
140°
C
120°
D
150°
Correct Answer: 160°
As we know that sum of all the internal angles of the triangle is 180°. Therefore x+y+z=180° Therefore 30°+130°+z=180° Therefore z=120° Now we know that the external angle is always a linear angle. Therefore x+y=180° Therefore 20°+y=180° Therefore y=160°.