Question

. In a quadrilateral, if 55°, 75° and 140° are 3 angles, then 4th angle is​

Answer 1

Answer:

90°

Step-by-step explanation:

All the angels of a quadrilateral sum up to 360°. so, 360 - ( 55 + 75 + 140 ) = 90

Answer 2

Answer:

sum of angles of quadrilateral =360

let fourth angle=x

55+75+140+x=360

130+140+x=360

270+x=360

x=360-270

x=90