Question

If three angles of a quadrilateral are 20 degre 90 degre and 90 degrevfind the fourth angle of the quadrilateral

Answer 1

let 4th angle be x

20 + 90 + 90 + x = 360

200 + x = 360

x = 360 - 200

x = 160

Answer 2

Let the fourth angle be x

As we know, sum of all the angle of quadrilateral = 360°

20°+90°+90°+x = 360°
200°+x = 360°
x = 360°-200°
x = 160°

The fourth angle = 160°

#Hassan