CD is tangent to the circle and AE is perpendicular to AC. If a radius of the circle measures 12 in., which is the vale of DF + AF?
Last edited by sanee66; Jul 12th 2007 at 05:49 PM. Reason: attachment
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Let . In . In . Then
Hello, sanee66! In right triangle Then: . .[1] In right triangle .[2] Substitute [1] into [2]: . Therefore: . [Darn, this is identical to red_dog's solution!]
Using trigo. for this problem is like kill a fly with a Grand Cannon. We have two triangles Finally Properties of triangle are easily proved applying the Pythagorean Theorem.
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