Question

The three angle ofquardrilateral are 40,70,105 find the forth angle

Answer 1

let x be the fourth angle..

Now,

By angle sum prpty. of a quadrilateral...

40+70+105+x=360°
→215°+x=360°
→x=(360-215)°
→x=145°


so the fourth angle is 145°

Hope it helps....
Regards,
Leukonov.