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S=R2 3.14102314 (c m )2 3.1462113.04 (c m )2314113.04200.96(c m )2200.96 3.14102 r )2=314(10036)=3.1464=200.96 S=(R2 3.14621.8m3.14(1.82) 23140.90.9(m )23140.812.54341.81.83.24 (m )21.27173.244.5117(m )2843.14442=3225.12=6.88(cm )246623.14332=1814.13=32.13(cm )2 3.14102 3.1482314200.96113.04 ( m )2半径=50.243.142=8(米)S=3.1488=200.96(平方米)牡丹、郁金香:200.96367(m )2百合、玫瑰:200.96633(m )2圆的面积是正方形面积的倍S=3.148=25.12(平方厘米) 涂色:25.1243=6.283=18.84(m )2