10.07.2015 Views

Plane Geometry - Bruce E. Shapiro

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228 SECTION 41. EUCLIDEAN CIRCLESBy the Pythagorean theorem(OP ) 2 = (OA) 2 − (AP ) 2= (OA − AP )(OA + AP )= (OA − AS)(OA + AS)because AS = r = AP= OS(OA + AT )because AT = r = AS= (OS)(OT )Thus by case 3 the power is well defined.« CC BY-NC-ND 3.0. Revised: 18 Nov 2012

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