在高中数学必修2“空间几何体的直观图”这一节课后练习中,第3题利用斜二测画法得到的:①三角形的直观图是三角形,②平行四边形的直观图是平行四边形,③正方形的直观图是正方形,④菱形的直观图是菱形,以上结论正确的是()。在传统教学中,教师让学生举例,利用斜二测画法画平面图形的直观图,观察,得出结论。采用这种方法,比较费时,而且学生画的是特例,不是任意的图形。利用几何画板,可以任意改变平面图形的形状,相 In high school mathematics compulsory 2 “spatial geometry of the visual map ” This lesson after the exercise, the third question using the oblique two test method obtained: ① triangle is a straightforward view of the triangle, ② parallelogram of the parallelogram is parallel Quadrilateral, ③ square is the square of the intuitive map, ④ diamond intuitive map is diamond, the conclusion is correct (). In the traditional teaching, teachers give students an example, the use of oblique two drawing flat-screen graphics to draw a direct view, observe and draw conclusions. Using this method, more time-consuming, and students draw a special case, not arbitrary graphics. Use geometric drawing board, you can change the shape of the plane graphic, phase