20 1 1 Chongqing mathematics entrance examination paper: the last question and the second question: according to the graphic characteristics of the overlapping part of equilateral △EFG and rectangular ABCD, it is divided into 0 ≤ t < 1, 1 ≤ t < 3, 3 ≤ t < 4 and 4 ≤ t < respectively.