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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,.,*,圆的面积,人教版小学数学六年级第十一册,李翔,130801105,.,1,圆的面积人教版小学数学六年级第十一册李翔 130801105,2,米,在长满青草的草地上一匹马被主人用一根两米长的绳子栓在一棵树，这匹马最多能吃到多少青草？,.,2,2米 在长满青草的草地上一匹马被主人用一根两米长的,.,3,.3,.,4,.4,.,5,.5,.,6,.6,.,7,.7,.,8,.8,.,9,.9,.,10,.10,.,11,.11,.,12,.12,.,13,.13,.,14,.14,.,15,.15,.,16,.16,.,17,.17,.,18,.18,.,19,.19,.,20,.20,.,21,.21,.,22,.22,.,23,.23,.,24,.24,.,25,.25,.,26,.26,.,27,.27,.,28,.28,.,29,.29,.,30,.30,高,底,.,31,高底.31,高,底,.,32,高底.32,高,底,.,33,高底.33,高,底,.,34,高底.34,高,底,.,35,高底.35,高,底,.,36,高底.36,高,底,.,37,高底.37,高,底,.,38,高底.38,高,底,.,39,高底.39,高,底,.,40,高底.40,高,底,.,41,高底.41,高,底,.,42,高底.42,高,底,.,43,高底.43,高,底,.,44,高底.44,高,底,.,45,高底.45,高,底,.,46,高底.46,高,底,.,47,高底.47,高,底,.,48,高底.48,高,底,.,49,高底.49,高,底,.,50,高底.50,高,底,.,51,高底.51,高,底,.,52,高底.52,高,底,.,53,高底.53,高,底,.,54,高底.54,高,底,.,55,高底.55,高,底,.,56,高底.56,高,底,.,57,高底.57,高,底,.,58,高底.58,高,底,.,59,高底.59,高,底,.,60,高底.60,高,底,.,61,高底.61,高,底,.,62,高底.62,高,底,.,63,高底.63,高,底,.,64,高底.64,高,底,.,65,高底.65,高,底,.,66,高底.66,高,底,.,67,高底.67,高,底,.,68,高底.68,高,底,.,69,高底.69,高,底,.,70,高底.70,高,底,.,71,高底.71,高,底,.,72,高底.72,高,底,.,73,高底.73,高,底,.,74,高底.74,高,底,.,75,高底.75,高,底,.,76,高底.76,高,底,.,77,高底.77,高,底,.,78,高底.78,高,底,.,79,高底.79,高,底,.,80,高底.80,高,底,.,81,高底.81,高,底,.,82,高底.82,高,底,.,83,高底.83,高,底,.,84,高底.84,高,底,.,85,高底.85,高,底,.,86,高底.86,高,底,.,87,高底.87,.,88,.88,.,89,.89,.,90,.90,.,91,.91,.,92,.92,.,93,.93,.,94,.94,.,95,.95,.,96,.96,.,97,.97,.,98,.98,.,99,.99,.,100,.100,.,101,.101,.,102,.102,.,103,.103,.,104,.104,.,105,.105,.,106,.106,4份,8份,长方形,16份,32份,.,107,4份8份长方形16份32份.107,=,C,2,r,r,长等于圆周长的一半,宽等于圆的半径,.,108,=Crr长等于圆周长的一半宽等于圆的半径.108,=,C,2,r,r,长方形的面积,=,长,宽,r,r,圆的面积,=,=,r,2,长等于圆周长的一半,宽等于圆的半径,C=2r,.,109,=Crr长方形的面积 = 长 宽r r 圆的,如果用,S,表示圆的面积，圆的半径是,r,。,那么圆的面积计算公式：,S,=,r,2,.,110,如果用S 表示圆的面积，圆的半径是r。S=r2.,谢谢！,敬请各位同学指教！,退出,.,111,谢谢！敬请各位同学指教！退出.111,
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