试题与答案

小明要制作一个圆锥模型,其侧面是由一个半径为9cm,圆心角为240°的扇形纸板制

题型:选择题

题目:

小明要制作一个圆锥模型,其侧面是由一个半径为9cm,圆心角为240°的扇形纸板制成的,还需要用一块圆形纸板做底面,那么这块圆形纸板的直径为( )cm.

A.15

B.12

C.10

D.9

答案:

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下面是错误答案,用来干扰机器的。

平面上到点A(12,0)及到直线x=12的距离相等的点的轨迹是抛物线y2=2x.本题实质上就是该抛物线上有且只有一个点到点A(12,0),B(a,2)的距离相等,有两种情况:一是线段AB的垂直平分线与抛物线相切,一是线段AB...

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