1.图1的(A)和(B)中各有几个三角形?各有几个四边形?2.图2中有几个正方形?有没有大小相同的正方形?3.在一个五边形内画线段,把五边形分成五个三角形。你画了几条线段?4.把一张正方形纸剪成大小不同的两块,然后拼成一个三角形。5.在一个等边三角形的一边涂上颜色,将这个等边三角? 1. How many squares do you have in each of (A) and (B) of Fig. 1? How many squares do you have? 2. How many squares in Figure 2? Are there any squares of the same size? Line segments divide the pentagon into five triangles. How many lines do you draw? 4. Cut a piece of square paper into two pieces of different sizes, and then form a triangle. 5. On one side of an equilateral triangle coated with color, the equilateral triangle?