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歡迎您訪問數學考題練習:等腰三角形的周長為30厘米,一邊的長為12厘米!

數學考題練習:等腰三角形的周長為30厘米,一邊的長為12厘米

更新時間:2024-01-12 12:53:37作者:貝語網校

等腰三角形的周長為30厘米,一邊的長為12厘米,則另兩邊的長是

A.12厘米、6厘米

B.9厘米、9厘米

C.12厘米、9厘米

D.12厘米、6厘米或9厘米、9厘米

試題答案

D

若12厘米的邊為底,則腰長為(30-12)÷2=9;若12厘米的邊為腰,則底邊長為30-12×2=6.它們都符合三角形三邊關系定理.選D.
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