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太受颖1418小学二年级上对于钝角是如何定义的?五角星内的钝角到底算不算角?一个空心的五角星(内)有几个角? -
籍竖习13238128974 ______[答案] 钝角是大小介于 直角(90°)和 平角(180°)之间的角. 即:90°<钝角<180° 五角星内部没有钝角,你所说钝角,应该是它外部的啊.当然算角.

太受颖1418二年级直角的含义 -
籍竖习13238128974 ______ 一条边与另一条边相交并成90度的脚,叫直角

太受颖1418求助@ 小学:线、角、平面图形的概念! 谢谢了 好人一生富贵啊!!! -
籍竖习13238128974 ______ 线、角、平面图形、立体图形 线 直线 把线段向两端无限延伸所形成的图形叫做直线.我们前面所学的数轴就是建立在直线基础上的.直线没有端点,可以向两端无限延伸.直线有两种表示方法:(1)用直线上的两点表示,如图 ,记作直线AB...

太受颖1418角的两种定义方法是什麽?(初一) -
籍竖习13238128974 ______ (1)静态的:从一点引出的两条射线所组成的图形叫做角.(学生在小学已学过,所以只一语带过) (2)动态定义:一条射线绕着它的端点旋转,旋转起始位置与旋转终止位置所组成的图形叫做角

太受颖1418小学二年级数学中能说平角吗 -
籍竖习13238128974 ______ 你说的也有道理啊,但是书中说从一点引出的两条射线组成的就是角,但是这两条射线重合了呀,所以才叫平角,而不是角,角的范围是大于0度小于180度的,而不等于180度,在你们小学是这么规定的,平角是180度的,不在角的范围内.但是你这么小就能考虑这么多,以后数学一定顶呱呱啊

太受颖1418小学二年级对角的认识不会怎么办 -
籍竖习13238128974 ______ 用实物进行讲解会加深他们的印象,再联系生活中的现象可以加强他们的理解

太受颖1418小学二年级数学题,角是有大小的,角的大小和边的( )有关,和边的(小学二年级数学题,角是有大小的,角的大小和边的( )有关,和边的( )无关 -
籍竖习13238128974 ______[答案] 角是有大小的,角的大小和边的( 开口大小)有关,和边的(长短 )无关

太受颖1418小学二年级不全是直角?小学二年级不全是直角,指的是那种图形
籍竖习13238128974 ______ 不全是直角,可以是平行四边行,可以是等腰直角三角形 梯形

太受颖1418二年级数学当中,这两个是角吗 -
籍竖习13238128974 ______ 两个角合起来的那个角,要数进去.中间有一条对角线的梯形一共有8个角,先数单个的角,再数两个角合起来的角.有时候根据题目还要数三个、四个角合起来的角,一直数到拼成的最大的角为止.

太受颖1418什么是外角,数学书上的定义? -
籍竖习13238128974 ______ 说明白点就是外面的角,就是图上标数字的那些