四边形、三角形和圆形,是我们熟知的图形,它们各有特点,又相互联系。今天,各种平面图形们举行了一次欢乐聚会,我们也来瞧瞧吧!开场舞——找朋友((规则要求规:只有特点相似的嘉宾才能做舞伴做舞伴,你知道谁和谁是一组吗是一组吗?)平行四边形邀请菱形:“我们俩都有互相平行并且相等的对边。”菱形点头答应:“嗯!不过,我的四条边都相等,你可不具备哦!”正方形与长方形一起翩翩起舞:“我们俩不仅对边平行且相 Quadrilateral, triangle and circle, is a well-known figure, they have their own characteristics, but also interrelated. Today, a variety of graphic graphics held a happy party, we also take a look at it! Opening dance - to find friends ((Rule rules: only the characteristics of similar guests to be partners to do the partner, who do you know and who is Are the groups a group?) Parallelogram Invitations Diamonds: ”We both have opposite sides that are parallel and equal to each other.“ Diamond nods promise: ”Uh !, but my four sides are equal and you do not have it ! “Square and the rectangle dance together: ” The two of us not only parallel to the side and phase