:ADCE±g?3`p=²³f0CZ>±g??@/\r(2 ) ¬s´gh^`ABCD?®D F*µ¶\npZ35AC: BD·¸iJL¹º=>?».\r O 2 QRW p^`ABCD0p AB/7CD, ZA=60° , AD=BC = DC\rUWA8 = 2CO.\rA B.\r pG!`ABCD0pABDCD,ND=2NB,K AD=a,AB=h,¼ CD?"*\r O 3 p^`ABCD0pADDBC 6 E?F ()*A D ?BC ?0&pKNB + NC=90° .AD\r= 7 , BC = 15 , U EF .\r O 4 QRW p^`ABCD0p ABDCD, AC=BD.\rUW^`ABCD*gh^`.\rA B.\r O 5 QRW p^`ABCD0pADDBC, E * C D ?0&p- AE_LBE.\rUWAD+BC=AB\r XYp^`ABCD0pAD/7BC, E * C D ?0&p- AD+BC=AB\rUWDE±AE?\r O 6 p^ ` A B C D 0 pAB//CD, C E ?B E ( ) 4 ( N C V N B , E # A D ?0\r& H\rU WA B +D C = BC .\rA B
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