00:01
Okay, this is problem number 17.
00:03
We are told that pt is tangent to the circle, and we need to find the length that's indicated.
00:13
So they gave us a diagram similar to what's shown here, and they also told us that pt, pt is equal to 6, p b is equal to 3, and we need to find ab.
00:40
So let's set ab to equal x.
00:50
If we look at this, we know then that ap will equal ab plus bp, which we know as being x plus 3.
01:11
So we can figure that out.
01:14
We also know that when a second segment and a tangent segment are drawn, on to the circle from the same external point, which is p, the product of the secant segment and the external segment can be equal to the square of the tangent...