Question

answer is 90°.....
Appropriate explanation will marked as brainlist...​

Answer 1

Answer:

x=90°

Step-by-step explanation:

Angle B=120, Angle B, considering inside the quadrilateral will become 60°(180-120)

Sum of all the interior angles of a quadrilateral is equal to 360°.

70+x+(2x-40)+60=360

70+x+2x-40+60=360

3x+70+60-40=360

3x+130-40=360

3x+90=360

3x=360-90

3x=270

x=270/3

x=90°