ΔABC is an isosceles triangle in which AB=AC. Side BA is produced to D such that AD=AB. Show that ∠BCD is a right angle.

ΔABC is an isosceles triangle in which AB=AC. Side BA is produced to

1.	ΔABC is an isosceles triangle in which AB=AC. Side BA is produced to D such that AD=AB. Show that ∠BCD is a right angle.
Answer» $Δ A B C$ is an isosceles triangle in which $A B = A C$ . Side $B A$ is produced to $D$ such that $A D = A B$ . Show that $∠ B C D$ is a right angle.