285,414 views
17 votes
17 votes
From the diagram below, if AC is a tangent line, and if PD = 9 and DC = 32, find the length of BC.

From the diagram below, if AC is a tangent line, and if PD = 9 and DC = 32, find the-example-1
User ValenceElectron
by
3.4k points

1 Answer

15 votes
15 votes

Solution:

Given the circle;

From the circle theorem, triangle PBC is a right triangle.


\begin{gathered} PB=PD=9 \\ \\ PC=PD+DC=9+32 \\ \\ PC=41 \end{gathered}

Using the Pythagorean theorem;


\begin{gathered} BC=√(PC^2-PB^2) \\ \\ BC=√(41^2-9^2) \\ \\ BC=√(1600) \\ \\ BC=40 \end{gathered}

CORRECT OPTION: C

From the diagram below, if AC is a tangent line, and if PD = 9 and DC = 32, find the-example-1
User Dmitry Sadakov
by
3.1k points