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初一數學角平分線幾何問題
初一數學角平分線幾何問題
更新时间:2024-10-08 07:27:40

如圖,AC=BC,∠C=90゜,∠CAD=∠EAB,BE⊥AE,求證:AD=2BE

初一數學角平分線幾何問題(初中幾何角平分線定理)1

提示:角平分線定理

證明:延長BE交AC延長線于F,BE=EF,△ACD≌△BCF,AD=BF,∴AD=2BE

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