Question

help for brillent plz help

Answer 1

∡FEA=180-[30+90]  =180-120 =60 degree

∡BEC=∡FEA=60 degree  [verticle opposit]

∡BEC +X =18O degree [CO- INTERIOR ANGLE]

60 +X=180

X=180-60

X-120degree ANS

OR you can do this way also

∡FEB=90+30=120 DEGREE [exterior ∡=sum of the opposit interior angle]

∡FEB+∡BEC=180 degree [linear pair]

120 +∡BEC=180 degree

∡BEC=180 -120= 60 degree

∡BEC +X =18O degree [CO- INTERIOR ANGLE]

60 +X=180

X=180-60 ans