Similar Triangle Lemma

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(OA) · (OA ') = r^2

(OB) · (OB ') = r^2

(OA) · (OA ') = (OB) · (OB ')

OA/OB = OB '/OA '

∠AOB = ∠B ' OA '

∴ ΔOBA ∼ΔOA ' B '      by sas

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Last Modified: Sun Nov 27 12:22:44 PST 2005