Question

A n isosceles triangle abc with ab=ac a circile passing through b and
c. Intesect the sides ab and ac at d and
e. Prove that de is parallel to bc

Answer 1

Answer:

DE || BC

Step-by-step explanation:

to prove :DE || BC

1 = 5 corresponding angles

proof : 1+4= 180 ... opp angles of cyclic quadrilateral

1 + (180-6) = 180

1+6=180

similarly

2+5=180

but ,

1=2.... isosceles ∆ theorem

therefore 1=5

DE || BC

{1,2,3,4,5,6 ARE THE ANGLES}