题目

已知:∥∥∥,平行线与、与、与之间的距离分别为1、2、3,且1 =3 = 1,2 = 2 . 我们把四个顶点分别在、、、这四条平行线上的四边形称为“格线四边形”.  【探究1】 ⑴ 如图1,正方形为“格线四边形”,于点,的反向延长线交直线于点.  求正方形的边长.  【探究2】 ⑵ 矩形为“格线四边形”,其长 :宽 = 2 :1 ,则矩形的宽为_____. (直接写出结果即可)  【探究3】 ⑶ 如图2,菱形为“格线四边形”且∠=60°,△是等边三角形,                 —Why did Emma cry so much when the cake fell on the floor?     —She _____ it all morning.    A. decorated                             B. had decorated    C. was decorating                         D. had been decorating   
数学 试题推荐