圓的面積人教版小學(xué)數(shù)學(xué)六年級第十一冊李翔130801105.....1圓的面積人教版小學(xué)數(shù)學(xué)六年級第十一冊李翔1308011052米

在長滿青草的草地上一匹馬被主人用一根兩米長的繩子栓在一棵樹，這匹馬最多能吃到多少青草？.....22米在長滿青草的草地上一匹馬被主人用一根兩米長的.....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.....1064份8份長方形16份32份….....1074份8份長方形16份32份….....107－=πC2rr長等于圓周長的一半寬等于圓的半徑.....108－=πCrr長等于圓周長的一半寬等于圓的半徑.....108－=πC2rr長方形的面積=長×寬πr

r

圓的面積

=×

=πr2

長等于圓周長的一半寬等于圓的半徑C=2πr.....109－=πCrr長方形的面積=長×寬πrr圓的

如果用S

表示圓的面積，圓的半徑是r。那么