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歡迎您訪問數學考題練習:已知三角形三邊長分別為2,x,13,若x為正整!

數學考題練習:已知三角形三邊長分別為2,x,13,若x為正整

更新時間:2024-01-12 16:27:12作者:貝語網校

已知三角形三邊長分別為2,x,13,若x為正整數,則這樣的三角形個數為

A.2

B.3

C.5

D.13

試題答案

B

試題解析

根據三角形的三邊關系:三角形兩邊之和大于第三邊,兩邊差小于第三邊;解答即可;

解答:由題意可得,,

解得,11<x<15,

所以,x為12、13、14;

故選B.

點評:本題考查了三角形的三邊關系:三角形兩邊之和大于第三邊,兩邊差小于第三邊;牢記三角形的三邊關系定理是解答的關鍵.

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