问题
解答题
两根6.28dm长的铁丝，一根围成正方形，一根围成圆，正方形的面积是圆面积的百分之几？
答案
（6.28÷4）2÷[3.14×（6.28÷3.14÷2）2]，
=1.572÷[3.14×12]，
=2.4649÷3.14，
=0.785，
=78.5%；
答：正方形的面积是圆面积的78.5%．
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两根6.28dm长的铁丝，一根围成正方形，一根围成圆，正方形的面积是圆面积的百分之几？
（6.28÷4）2÷[3.14×（6.28÷3.14÷2）2]，
=1.572÷[3.14×12]，
=2.4649÷3.14，
=0.785，
=78.5%；
答：正方形的面积是圆面积的78.5%．
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