the vertices of an equilateral triangle are on a circle.比较三角形边长和圆的直径谁大?

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the vertices of an equilateral triangle are on a circle.比较三角形边长和圆的直径谁大?

the vertices of an equilateral triangle are on a circle.比较三角形边长和圆的直径谁大?
the vertices of an equilateral triangle are on a circle.
比较三角形边长和圆的直径谁大?

the vertices of an equilateral triangle are on a circle.比较三角形边长和圆的直径谁大?
The vertices of an equilateral triangle are on a circle.
  The length of a side of the triangle The diameter of the circle
  在拿到题目的时候就应该在脑海中形成这样一个图像:一个等边三角形内接在一个圆里面.那么所有的数值都可以算出来,先不要看题目,我们心算出圆的半径和等边三角形的一个边的关系:1:√3,其他关系,比如三角形和圆面积的关系也可以都算出来,这时候再来看题目的两个题肢:三角形一个边的边长,和圆的直径(注意是直径不是半径),他们的比值就是√3:2,也就是1.732:2 (这些基本的数值要知道)那么很显然就是选B.

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