Paste: triangle proof

Author: doobie-do
Mode: text
Date: Sun, 12 Feb 2012 02:53:08
Plain Text | 
eq 1   DBC + 90 + DCB = 180
eq 2   DAC + 90 + ACD = 180

eq 1   DBC + DCB = 90
eq2    DAC + ACD = 90

eq 3   DCB + ACD = 90

therefore, DCB = 90 - ACD

substitute into eq 1:

DBC + 90 - ACD = 90 --> DBC = ACD

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