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苏教版小学数学第十一册

苏教版小学数学第十一册. 圆的认识. 执 教 人:常州市北环路小学张静虹. 线段围成的. 曲线围成的. ·. ·. 半径 r. 直径 d. O. 圆心. 图中哪些是半径?哪些是直径?哪些不是,为什么?. G. E. C. F. B. M. o. D. N. H. 同圆内,直径有无数条,长度都相等。. o. r. r. •. d. o. r. r. r. •. d. o. r. •. d. o. r. r. r. d=2r. •. r= d. 2. d. o. r. ·. ·.

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苏教版小学数学第十一册

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  1. 苏教版小学数学第十一册 圆的认识 执 教 人:常州市北环路小学张静虹

  2. 线段围成的 曲线围成的

  3. · · 半径 r 直径 d O 圆心

  4. 图中哪些是半径?哪些是直径?哪些不是,为什么?图中哪些是半径?哪些是直径?哪些不是,为什么? G E C F B M o D N H

  5. 同圆内,直径有无数条,长度都相等。 o

  6. r r • d o

  7. r r r • d o

  8. r • d o r r

  9. r d=2r • r= d 2 d o r

  10. · · O O 等圆的半径相等,直径相等

  11. 练习: (1)画圆时,圆规两脚间的距离是( )。 A.半径长度 B.直径长度 (2)从圆心到( )任意一点的线段,叫半径。 A.圆心 B.圆外 C.圆上 (3)通过圆心并且两端都在圆上的( )叫直径。 A.直径 B.线段 C.射线

  12. 再见

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