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数学
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如图,△ABC中AD⊥BC于D,AB=3,BD=2,DC=1,则AC等于( )
A. 6
B.
6
C.
5
D. 4
人气:399 ℃ 时间:2019-07-15 23:56:52
解答
∵AD⊥BC
∴∠ADC=∠ADB=90°
∵AB=3,BD=2,
∴AD=
AB
2
−
BD
2
=
5
∵DC=1
∴AC=
AD
2
+
CD
2
=
6
.
故选B.
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