BD=CD,AC=3,AB=5,求AD的取值范围

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BD=CD,AC=3,AB=5,求AD的取值范围BD=CD,AC=3,AB=5,求AD的取值范围 BD=CD,AC=3,AB=5,求AD的取值范围延长AD到E,使得AD=DE,连BE,由BD

BD=CD,AC=3,AB=5,求AD的取值范围
BD=CD,AC=3,AB=5,求AD的取值范围
 

BD=CD,AC=3,AB=5,求AD的取值范围
延长AD到E,使得AD=DE,连BE,
由BD=CD,∴△BDE≌△CDA,(S,A,S)
∶BE=AC=3,
在△ABE中:AB-BE<AE<AB+AE,
5-3<2AD<5+3
∴1<AD<4.