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11F推:C大講的有點問題~角A=50~角B=60~角C=70~一定不是等腰12/31 17:09
12F→:三角形OBD中~角OBD=30度~角D=90度~故線段DB=5根號312/31 17:10
13F→:又三角形BCD中~角B=60度~角D=90度~所以線段CD=15~12/31 17:13
14F→:且線段BC=10根號312/31 17:13
15F→:所求=三角形ACD周長-線段CD+線段BD+線段BC=25+15根號312/31 17:14
6F→:又三角形BCD中~角B=60度~角D=90度~所以線段CD=15~12/31 17:11
7F→:且線段BC=10根號312/31 17:11
8F→:所求=三角形ACD周長-線段CD+線段BD+線段BC=25+15根號312/31 17:12