Hello, geniusgarvil!

This reminds me of a classic problem.

Is there a typo?

is an isosceles triangle with

The bisector of angle meets at

and

Determine angle

LetCode:A * / \ / θ \ / \ / * D / * 2θ\ / θ * \ / * θ 2θ \ B * - - - - - - - * C

Since is isosceles,

is an exterior angle to

. . Hence:

Since is isosceles,

In

Therefore: .