(Solved):   1. Please copy the following two-dimensional graph by hand drawing, drawing scale is 1 : 1 ...

 

1. Please copy the following two-dimensional graph by hand drawing, drawing scale is 1 : 1. 2. Please draw the three projections of the line \( A B \), the coordinates of endpoints \( A \) and \( B \) are (40, \( 30,10) \) and \( (20,45,50) \) respectively. Then draw the three projections of the line \( C D \), the coordinates of endpoints \( \mathrm{C} \) and \( \mathrm{D} \) are \( (40,10,15) \) and \( (20,25,55) \) respectively. And please point out the relative position between line \( \mathrm{AB} \) and line \( \mathrm{CD} \) (parallel, intersection or not in one plane). 3. Please draw the three projections of a triangular plane \( \mathrm{ABC} \), The coordinates of the three vertices of this triangular plane are \( \mathrm{A}(80,40,10), \mathrm{B}(30,40,50) \) and \( \mathrm{C}(15,10,30) \) respectively. Then draw the three projections of a point \( \mathrm{D}(35,26,33) \), and judge whether the point \( \mathrm{D} \) is in the triangular plane \( \mathrm{ABC} \) or not.