Question

from the following figures find the value of x

Answer 1

Sum of all angles in a quadrilateral = 360°
therefore 130°+80°+x+90° = 360°
x = 360° - 300° = 60°

Answer 2

sum of all angles of a quadrilateral is 360.

In given figure

90+130+80 +x=360

300+x=360
x=60