《認(rèn)識(shí)圓》教學(xué)設(shè)計(jì)

1、認(rèn)識(shí)圓教學(xué)設(shè)計(jì)認(rèn)識(shí)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(shí)驗(yàn)教科書(shū)？數(shù)學(xué)（六年級(jí)上冊(cè)）第5657頁(yè)教學(xué)目標(biāo)： 1、認(rèn)識(shí)圓，了解圓各部分的名稱(chēng)。2、掌握?qǐng)A的特征，理解和掌握在同一個(gè)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(dòng)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(diǎn)：掌握?qǐng)A各部分的名稱(chēng)。教學(xué)難點(diǎn)：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(jiàn)過(guò)哪些物體的面是圓的？（輪胎、月餅、瓶蓋）。圓和我們以前學(xué)過(guò)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(shuō)的“圓”是什么樣的呢？（教師

2、用圓規(guī)演示畫(huà)出一個(gè)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(shí)圓。二、自主探究圓各部分的名稱(chēng)師：圓里藏有什么數(shù)學(xué)知識(shí)呢？請(qǐng)自學(xué)課本第56頁(yè)。師：通過(guò)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(guò)自學(xué)知道了圓心、半徑、直徑。師：請(qǐng)?jiān)谀愕膱A上畫(huà)出一條半徑和一條直徑，觀察你能發(fā)現(xiàn)它們的長(zhǎng)度有什么關(guān)系？（直徑是半徑的2倍）師：驗(yàn)證量師：繼續(xù)畫(huà)、繼續(xù)量，還有什么新的發(fā)現(xiàn)？（無(wú)數(shù)、相等）師：是不是所有的半徑都相等呢？（討論）師：這兩個(gè)圓一樣大嗎？為什么會(huì)不一樣？是誰(shuí)決定了圓的大??？師：半徑或直徑?jīng)Q定圓的大小，那誰(shuí)決定圓的位置呢？（看課件演示）

3、追問(wèn)：如果圓心向右移動(dòng)，圓的位置會(huì)怎么變？誰(shuí)決定了圓的位置。四、小結(jié)師：今天通過(guò)各種方法認(rèn)識(shí)了圓，還了解了圓的許多知識(shí)，我們知道 五、分層師：用今天我們學(xué)到的知識(shí)去完成分層測(cè)試卡37頁(yè)的練習(xí)。qcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3p tgz7r4i30ka1dkaghn3xtk

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