Question

three of the angles of a quadilateral are 65°,90° and 150°.dind the fourth angle.

Answer 1

Let the fourth angle be x°

We know that sum of all the angles is a quadrilateral is 360°

So, 

65°+ 90° + 150° + x° = 360°

305° + x° = 360°

x° = 360° - 305°

x°= 55°

Answer 2

heya

I think it is so easy

as you know that the sum all of angle of quad is 360°

so ,65°+90°+150°+x= 360°
x=360°-305

=55° is forth side .
hope it help you..

@rajukumar.