数学题:将一个底面周长25.12分米，高5分米的圆柱形木料，加工成体积最大的长方体，求长方体木料体积。

数学题解答：先画图，长方体的高应等于圆柱体的高。若想长方体的体积最大，则长方体的底面应为正方形，且四个角应分别与圆相接触，即长方体的底面，是圆柱底面内的最大正方形。

接下来是计算，先算出底面的直径：

25.12　÷　3.14 ＝8（分米）

再算出底面半径：8　÷　2　＝　４(分米)

再算出正方形的面积（当成两个大三角形来算）：8×4÷2×2=32（平方分米）

最大的长方体的体积：32×5=160（立方分米）

推荐阅读：
How Martha Stewart Became One Of The Best Bloggers On The Web　 Social Media and Dating Apps: How They’re Changing Love　 Did You Know There Are Some Great Scientific Reasons to Use Emot　 5 Simple Tips for Creating More Irresistible Product Pages　 You Should Know These Facts About Instagram　 Why Bloggers Need to Understand Google Rankbrain　 How to Write Compelling Blog Content for Boring Niches　 Why Curvy Blogger Put On A Bikini For The First Time In 25 Years　 Blogger Gives His Secret To Becoming A Millionaire By Age 30　 One Food Blog Is Proving Just How Successful Food Blogs Can Be