题目内容
如图,△ABC中,∠C=90°,AC=BC,AD平分∠CAB交BC于D,DE⊥AB于E,且AB=8cm,则△DEB的周长是( )
A.6cm | B.8cm | C.10cm | D.12cm |
∵AD平分∠CAB,∠C=90°,DE⊥AB,
∴CD=DE,
∴AC=AE,
∴△DEB的周长=BD+DE+BE,
=BD+CD+BE,
=BC+BE,
=AC+BE,
=AE+BE,
=AB,
∵AB=8cm,
∴△DEB的周长是8cm.
故选B.
∴CD=DE,
∴AC=AE,
∴△DEB的周长=BD+DE+BE,
=BD+CD+BE,
=BC+BE,
=AC+BE,
=AE+BE,
=AB,
∵AB=8cm,
∴△DEB的周长是8cm.
故选B.
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