Question

Three angles of a quadrilateral are respectively equal to 110°, 50° and 40°. Find its fourth angles.

Answer 1

Given, 

Three angles of quadrilateral = 110^∘, 50^∘, 40^∘
Let fourth angle be = X^∘ 

As we know sum of all angles of a quadrilateral = 360^∘ 

So, 

110^∘+ 50^∘+ 40^∘+ X^∘ = 360^∘ 

X^∘= 360^∘ - 200^∘ = 160^∘