Question

Find the value of x in this case:

Answer 1

hey mate!!

100°+angle adjacent to that let it be angle 1=180
so, angle 1=180-100
angle 1=80°

now, 3x+80°=7x (because of exterior sum property)
80°=7x-3x
80°=4x
80/4=x
20=x


hope it helps!!