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正=
a2 , S菱形=
bc,∵b:a=a:c,即a2=bc,∴S正 :S菱形 =1:1
练习册系列答案
相关题目
Let a be the average of all odd prime numbers less than 50. The integer,most close to a is ( )(英汉小字典:average平均值;odd prime numbers奇质数)
| A、23 | B、24 | C、25 | D、26 |