Question

If four angles of a quadrilateral are 80 , 100 , X , (3x+20) then find x

Answer 1

Answer:

X=40°

Step-by-step explanation:

In quadrilateral ABCD,

AB + BC + CD + AD =360 degree

80°+ 100°+[ 3X + 20 ]+ X=360°

THEREFORE,4X+20=360°-180°

4(x+5)=180°

x+5=45°

x=40°