Question

if ab is parallel to CD ,then find value of angle BEC​

Answer 1

Also, it is given that CD is parallel to AB and we have assumed that AB is parallel to FG, then CD is parallel to FG

Therefore, considering CD║FG and CE is the transversal, then

∠DCE+∠CEG=180°(Co-interior angles)

100°+∠CEG=180°

∠CEG=80°

Now, ∠BEG=∠BEC+∠CEG

120°=x+80°

x=40°

Thus, the value of the ∠BEC=x=40°

Hope it helps you.....