题目

一根长2米，底面半径是4厘米的圆柱形木段，把它据成同样长的4根圆柱形的木段。表面积比原来增加了多少平方厘米？ 答案：【答案】301.44平方厘米【解析】圆柱形木料锯成4段后，表面积是增加了6个圆柱的底面的面积，由此利用圆的面积公式即可解答．3.14×4²×6＝301.44（平方厘米）答：表面积比原来增加了301.44平方厘米。Pointing to the house on _____ roof grew lots of bush , the old man told me that was ________ I would stay. A．its ; whatB．whose; what C．whose; whereD．its; where