数学题：把一个圆锥沿着高切开，得到了个如下图所示的物体。截面面积是10平方厘米，原来圆锥的高是5厘米。它的底面积是多少平方厘米。

数学题解答：

切面是一个三角形，三角形的面积是10平方厘米。圆锥的高是5厘米，这也是三角形的高。可以算出三角形的底（也是圆锥的底面直径）

10×2÷5=4（厘米）

再算底面积：3.14×(4÷2)²=12.56（平方厘米），问题解决。

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