# Thread: help

1. ## help

kindly expalin to me how to do the qn. thanks a lot

2. Originally Posted by helloying
kindly expalin to me how to do the qn. thanks a lot
What question??

CB

3. Originally Posted by helloying
kindly expalin to me how to do the qn. thanks a lot
HI

First notice that OC=18 , OB=18 , BP=14

Let P be the most left point .

Now , T is a tangent to the circle , so angle PTO is 90 degrees .

sin angle TOP = 18/32

Calculate angle TOP , then since PC is a straight line ,

so angle TOC = pi - angle TOP