Question

in the given figure ab parallel CF and CD parallel then find the value of x

Answer 1

ABIICF,consider those two lines and keep BC as the transversal
which gives angle BCF to be 40° (alternate interior angles are equal)
65°+40°+y=180(angles in a straight line)
105°+y=180°
y=75°
x and y are corresponding angles of the transversal CF in lines CD and EF
:.x=y=75°
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Answer 2

see the attached file for the answer
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