Is the perimeter of square S greater than the perimeter of equilateral triangle T ?

(1) The ratio of the length of a side of S to the length of a side of T is 4:5.

(2) The sum of the lengths of a side of S and a side of T is 18.


Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

考题讲解

题目分析:

本题判断正方形周长和等边三角形周长的关系。

(1)    正方形边长和三角形边长为4:5,所以设三角形边长为5a,正方形边长为4a,其中a为大于0的数,满足条件1,此时正方形周长为16a,三角形周长为15a,有16a>15a,题目得解。

(2)    正方形边长与等边三角形边长和为18,但不能确定正方形边长和等边三角形边长的具体值,也不能确定其周长大小关系。

因此,本题答案为(A),仅条件1可以解题,条件2不行。

 

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