Question

Question:15
Plss help me frndss

Answer 1

It's so simple..

As we know that in a circumscribe quad

Exterior angle = Interior opposite angle

∴ ∠BEF = ∠DAB    ......(1)

also in quad BECF

∠E + ∠C =180°                                                   (sum of opposite angles are 180°)    

But from (1) we get,

∠DAB + ∠FCB = 180°

∴ As sum of interior angles are 180° in a parallel line

Hence AD║CF

Cheers!!