中3~數學~全等3角形証明

畢氏定理:
AB=DC so dc = 8
8平方 +15 平方 = BC的平方
64+225 =BC平方
289 = BC平方
so...BC = 289的開方
BC = 17

FINISH!! 你幾年班AR?? 中二 ??

2006-11-05 18:38:58 補充：
AC = BD = 15AB = 88square 15square = BC square289 = bc square289 square root = BC BC = 17

a)AB =DC(given)
AD =AD(given)
angleABD=angleDCA
triangle ABD = triangle DAC(SAS)
so, AC=BD

b)triangle ABD = triangle DAC(proved in (a))
AC=BD=15 (given)
AB=8(given)
AB 2次方＋AC 2次方 = BC 2次方
8 2次方＋15 2次方 = BC 2次方
64＋225=BC 2次方
289=BC 2次方
BC=17

a)
AB =DC (given)
AD =AD (given)