Question

The three angles of a quadrilateral are 60°,80° and 120° find the fourth angle?

Answer 1

Explanation:

Angles in a quadrilateral add to 360°. So

`60+80+120+x=360` (where
`x` is the fourth angle)

`260+x=360`

`x=100`° (after subtracted 260 from both sides of equation)