# Area of a Circle on Each Side of a Chord

Thank you. We draw the bisector of $\theta$ so we divide it to two $\frac {\theta}{2}$s, but how can we prove that when bisector intersects Perpendicularly with c?
I mean to be confident about the "right triangle" stated in the article.
Thank you again.

#### skeeter

Math Team
Given: $\Delta ABC$ is isosceles and $BD$ bisects $\angle{ABC}$
You prove it ...

topsquark