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The figure below shows the circles O1 (radius r1) and O2 (radius r2). A1A2 and B1B2 are the common external tangents and CD is a common internal tangent. Prove that r1.r2 = A1C.A2C.
Home | Search | Geometry | Problems | All Problems | Open Problems | Visual Index | 1091-1100 | Circle | Tangent Line | Email | Post a comment or solution | By Antonio GutierrezLast updated: Mar 14, 2015