问题
解答题
刘大爷用15.7米长的篱笆靠墙围了一个半圆形的养鸡场，鸡场的面积是多少平方米？
答案
15.7÷3.14=5（米），
3.14×52÷2=39.25（平方米）．
答：鸡场的面积是39.25平方米．
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刘大爷用15.7米长的篱笆靠墙围了一个半圆形的养鸡场，鸡场的面积是多少平方米？
15.7÷3.14=5（米），
3.14×52÷2=39.25（平方米）．
答：鸡场的面积是39.25平方米．
| 完形填空。 | ||||
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