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November 21, 2014

November 21, 2014

Posted by **Raha** on Saturday, September 17, 2011 at 3:37pm.

- math -
**MathMate**, Saturday, September 17, 2011 at 7:29pmDraw a diagram for a geometry problem, and half of the time the solution will be right in front of your eyes.

Let the circle C with radius r has a centre O and the external point R is distance d away from O.

Draw a tangent from R to circle C and tangent at T.

Join OT.

By definition of a tangent, angle OTR is a right angle.

OT is known (r)

OR is known (d)

We need to calculate the distance TR, which is the remaining side of the right triangle OTR.

Bet you can take it from here.

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