【数角专项】二年级上册数学，常考易错点专题，期末专项突破练习

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颜娟败5066圆形桌面上也有角,争对二年级对吗 -
戎柿冯15827623620 ______ 圆形桌面上也有角,争对二年级是不对的. 从一点发出的两条射线所级成的图形. 有公共端点的两条射线组成的图形叫做角,这个公共点叫角的顶点,两条射线叫角的边.

颜娟败5066三个三角相加等十八,三个圆相加等二十四,那么一个三角加一个圆等于几,二年级数学 -
戎柿冯15827623620 ______ 三角=18÷3=6 园=24÷3=86+8=14

颜娟败5066圆形物体的面上有角吗?小学二年级题 -
戎柿冯15827623620 ______ 没有

颜娟败5066三角形加圆形等于一百,三角形减圆形等于二十四,三角形是多少,圆形是多少? -
戎柿冯15827623620 ______ 和差问题,(两数和+两数差)÷2=较大数 (两数和-两数差)÷2=较小数 (100+24)÷2=62(个)……………………三角形的个数 (100-24)÷2=38(个)……………………圆形的个数

颜娟败5066有三个正方形和三个圆在一个直角三角形中相切,最小的圆半径为19,最大的圆为99则另一个圆的半径是?
戎柿冯15827623620 ______ 在甲图形中, 大圆半径:中圆半径=中圆半径:小圆半径, 即中圆半径是大小两圆半径的比例中项. 中圆半径=根号下(19*99)=3倍根号下209

颜娟败5066圆中有一等腰角形(面积为5平方厘米),三角形直角顶点O在圆心处,另二点A、B分别交汇于圆周上,求圆的面积 -
戎柿冯15827623620 ______ 两个这样的等腰直角三角形拼起来是一个边长为半径的正方形,所以半径的平方等于10,圆的面积等于半径的平方乘圆周率,等于10π≈31.4平方厘米.