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過D作DE垂直BC 因為角C為45° 所以CE=DE 根據勾股關係EC平方+ED平方=DC平方 得CE=根號二 過A作AF⊥BC 同理得BF=根號二 周長=AD+DC+AB+BC=AD+DC+AB+BF+FE+EC=8+二倍根號二
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