Of all the triangles whose all sides are integers,how many triangles whose sides are 9 and 12?
A.21 B.3 C.17 D无数
人气：491 ℃ 时间：2020-06-05 06:04:21
解答
C
三角形两边之和大于大于第三边,两边之差小于第三边,所以第三条边的长度是4-20间的所有整数,共17个.
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