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新课标小学数学四年级上册

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新课标小学数学四年级上册. 执教者:张惠芳. 单 位:城关回民小学. ⌒. 2. 1. 你能一眼看出下面几组角的大小吗?. A. B. D. C. 把半圆分成 180 等份,每一份所对的角叫做 。记作 “ ” 。. 一度角. 把半圆分成 180 等分,每一份所对的角叫做 。记作 “ ” 。. 一度角. 1°. 1°. 认识量角器. 量角器的外刻度. 量角器的 90 ° 刻度线. 0. 0. 0. 0. 180. 180. 180. 180. 180. 0. 180. 180. 180. 180. 180.

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slide1

新课标小学数学四年级上册

执教者:张惠芳

单 位:城关回民小学

slide2

2

1

你能一眼看出下面几组角的大小吗?

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A

B

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D

C

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认识量角器

量角器的外刻度

量角器的90 °刻度线

0

0

0

0

180

180

180

180

180

0

180

180

180

180

180

0

0

0

0

0

量角器的中心

量角器的0 °刻度线

量角器的内刻度

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用量角器量角的步骤

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1、把量角器放在角的上面;使量角器的中心和角的顶点重合;

2、零度刻度线和角的一条边重合;

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用量角器量角的步骤

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50

50

50

50

1

0

1、把量角器放在角的上面;使量角器的中心和角的顶点重合;

2、零度刻度线和角的一条边重合;

3、角的另一条边所对的量角器上的刻度,就是这个角的度数。

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