摘要：7． Let be the length of a diagonal of a square, and be the length of two diagonals of a rhombus respectively. If ,then the ratio of area of the square and rhombus is
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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)
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