角的度量课件1.ppt3.ppt

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1、角的度量边边顶点·角角的度量1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100角的度量量角器1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100外圈刻度内圈刻度刻度线0刻度线0刻度线中心点学习材料一1、认识量角器各部分的名称1001010203040506070809080706050403020

2、180180110120130140150160170170160150140130120110100角的计量单位是“度”,用符号“°”表示。把半圆分成180等份,每一份所对的角的大小是1度,记作1°。1°学习材料二2、认识角的计量单位1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100角的计量单位是“度”,用符号“°”表示。把半圆分成180等份,每一份所对的角的大小是1度,记作1°。1°1°学习材料二2、认识角的计量单

3、位13、测量角的大小1°1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100（）×1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100（）×10010102030405060708090807060504030201801801101201301401501601701701601501401301

4、20110100×（）1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100130º50º量角器的中心点和角的顶点重合。量角器的0刻度线和角的一条边重合。点线100101020304050607080908070605040302018018011012013014015016017017016015014013012011010050º1001010203040506070809080706050403020180180

5、11012013014015016017017016015014013012011010050º100101020304050607080908070605040302018018011012013014015016017017016015014013012011010050º量角器的中心点和角的顶点重合。量角器的0刻度线和角的一条边重合。看内圈或外圈读度数。角的度量方法：1、我会量。1∠1=（）∠2=（）∠5=（）∠3=（）234125º45º30º30º5∠4=（）90º角的大小与角的两边画出的长短没有关系。角的大小要看两条边叉开的大小，

6、叉开得越大，角越大。1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100通过这节课的学习，你有什么收获？用量角器量角时，你想提醒大家注意什么？角的大小与角的两边画出的长短没有关系。角的大小要看两条边叉开的大小，叉开得越大，角越大。1001010203040506070809080706050403020180180110120130140150160170170160150140130120110100100101020

7、3040506070809080706050403020180180110120130140150160170170160150140130120110100100101020304050607080908070605040302018018011012013014015016017017016015014013012011010010010102030405060708090807060504030201801801101201301401501601701701601501401301201101001001010203040506070

8、8090807060504030201801801101201301401501601701701601501401301201101001001010203040