题目内容

Let a be the length of a diagonal of a square, b and c be the length of two diagonals of a rhombus respectively. If b:a=a:c,then the ratio of area of the square and rhombus is (  )

(A)1:1.   (B)2:.  (C)1:. (D)1:2.

(英汉词典:length长度;diagonal对角线;square正方形;rhombus菱形;respectively分别地;ratio比;area面积)

A

S=a2 ,  S菱形=bc,∵b:a=a:c,即a2=bc,∴S:S菱形 =1:1

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