Question

if three angles of a quadrilateral are 20 degree 90 degree and 90 degree find the fourth angle of the quadrilateral​

Answer 1

Answer:

Step-by-step explanation:

Let the 4th angle be x.

20°+90°+90°+x=360°(Angle Sum Property of a Quadrilateral)

200+x=360°

x=360-200

x=160°

Thank You

Answer 2

Answer

Sum of all angles of quadrilateral is 360.

Given A=20,B=90,C=90,

To find angle D

A+B+C+D= 360

20+90+90+D=360

200+D=360

D=360-200

D=160