《認(rèn)識圓》教學(xué)設(shè)計

1、認(rèn)識圓教學(xué)設(shè)計認(rèn)識圓柳州市北站路小學(xué) 張暉艷教學(xué)內(nèi)容：人教版義務(wù)教育課程標(biāo)準(zhǔn)實驗教科書？數(shù)學(xué)（六年級上冊）第5657頁教學(xué)目標(biāo)： 1、認(rèn)識圓，了解圓各部分的名稱。2、掌握圓的特征，理解和掌握在同一個圓或者在等圓中半徑和直徑的關(guān)系3、培養(yǎng)學(xué)生的觀察、動手操作能力，養(yǎng)成在交流、合作中獲得新知的習(xí)慣。教學(xué)重點：掌握圓各部分的名稱。教學(xué)難點：同圓或等圓中半徑和直徑的關(guān)系。教學(xué)準(zhǔn)備：多媒體課件、圓規(guī)、直尺、圓片等。一、引入師：生活中，你見過哪些物體的面是圓的？（輪胎、月餅、瓶蓋）。圓和我們以前學(xué)過的平面圖形有什么不同？師：這些平面圖形都是由線段圍成的封閉圖形。師：我們數(shù)學(xué)上說的“圓”是什么樣的呢？（教師

2、用圓規(guī)演示畫出一個圓）師：這就是圓，它是由曲線圍成的平面圖形。師：今天我們一起去認(rèn)識圓。二、自主探究圓各部分的名稱師：圓里藏有什么數(shù)學(xué)知識呢？請自學(xué)課本第56頁。師：通過自學(xué)，你知道了什么？折圓交流指辨一辨三、探究同圓或等圓中半徑和直徑的關(guān)系師：剛才我們通過自學(xué)知道了圓心、半徑、直徑。師：請在你的圓上畫出一條半徑和一條直徑，觀察你能發(fā)現(xiàn)它們的長度有什么關(guān)系？（直徑是半徑的2倍）師：驗證量師：繼續(xù)畫、繼續(xù)量，還有什么新的發(fā)現(xiàn)？（無數(shù)、相等）師：是不是所有的半徑都相等呢？（討論）師：這兩個圓一樣大嗎？為什么會不一樣？是誰決定了圓的大?。繋煟喊霃交蛑睆?jīng)Q定圓的大小，那誰決定圓的位置呢？（看課件演示）

3、追問：如果圓心向右移動，圓的位置會怎么變？誰決定了圓的位置。四、小結(jié)師：今天通過各種方法認(rèn)識了圓，還了解了圓的許多知識，我們知道 五、分層師：用今天我們學(xué)到的知識去完成分層測試卡37頁的練習(xí)。c29c91afe4ced1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afedd1b6c87d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af95ad9c91afe4ced1b6c8795ad91

4、afe4ced1b6c8795ad9d1b6c8795ad9c91afe4ced1b6c8795a1afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91afc91fe4ced1d1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6cd1b6c8795ad9c91afe4ced1b6c8795ad91afe4ced1b6c8795ad9c91fe4ced1b6c8795ad29c91af8795ad9c91fe4ced1d1b6c8795ad9c91afe4ced1b6c8795ad91afe

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