新课标小学数学二年级上册.ppt

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1、新课标小学数学二年级上册广西南宁市卫国小学广西南宁市卫国小学leishaoling leishaoling 制作制作学习新知稳固练习扩展探究学习导航三三角角形形五五角角星星角角角角角角角角这两个图形中都有角角下页返回返回下页返回返回 这是实物中的角这是实物中的角返回返回下页下页下页下页返回返回这是我们折的角这是我们折的角,请你看请你看下页下页返回返回边边顶点顶点边边一个角有一个一个角有一个顶点顶点 两条两条边边返回返回下页下页返回返回下页下页从一点起用直尺向不同方向画两条直线,就构成了一个角下页下页返回返回角的两边叉开越大角的两边叉开越大, ,角就越大角就越大21下页下页返回返回121 1 1

2、 1 1 1 1 1 1 1 1 1 112下页下页返回返回12下页下页返回返回121 1 1 1 1 1 1 1 1 1 1 1 112下页下页返回返回以下图形哪些是角？以下图形哪些是角？1( 2 )34( )( )( )( )下页下页返回返回判断角的儿歌判断角的儿歌角的顶点尖尖的角的顶点尖尖的,角的两边直直的角的两边直直的,不尖不直不是角不尖不直不是角.下页下页返回返回1.1.一个角由一个顶点和两一个角由一个顶点和两条边组成条边组成; ;2.角的大小只与角的张开角的大小只与角的张开程度有关程度有关,与边的长短无与边的长短无关关.下页下页返回返回下面的图形各有几个角？下面的图形各有几个角？一

3、共有一共有 6个角个角一共有一共有 7个角个角下页下页返回返回三角形去掉一个角后还有几个角三角形去掉一个角后还有几个角? ?请你尝试一下请你尝试一下下页下页返回返回6H7I9JaLcMdOfPgRhSjUkVmXnYpZq!s$t&v*w)x-z0A1C3D4F5G7I8JaLbMdNePgQhSjTkVlWnYoZq!r$t%u*w(x-z+A1B2D4E5G7H8J9KbMcNePfQhRiTkUlWnXoZp#r$s%u*v(x)y+A0B2D3E5F6H8I9KbLcNdOfQgRiTjUlVmXoYp#r!s%t&v(w)y+z0B1C3E4F6H7I9JaLcMdOfPgRhSjU

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5、nXoZq#r$s%u*v(x-y+A0B2D3E5G6H8I9KbLcNeOfQgRiTjUlWmXoYp#r!s%u&v(w)y+z0B2C3E4F6H7I9KaLcMdOfPgRiSjUkVmXnYp#q!s$t&v*w)y-z0A1C3D4F6G7I8JaLbMdOePgQhSjTkVmWnYoZq!r$t&u*w(x-z+A1C2D4E5G7H8JaKbMcNePfQhSiTkUlWnXoZq#r$s%u*v(x-y+A0B2D3E5G6H8I9KbLcNeOfQgRiTjUlWmXoYp#r!s%u&v(w)y+z0B2C3E4F6H7I9KaLcMdOfPgRiSjUkVmXnY

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