How to make dustpan by hand with tin foil

Draw a horizontal straight line with any edge, and draw a center line at both ends based on this line. Use the center line of the steel rule on the horizontal line to find the known floor width x height, and the upper end of the floor is known to be short width. Draw the short side of the upper end of the long side width connecting line at the lower end of the center line with a ruler, draw the extension line of the upper floor height, draw the intersection of two side heights and the lower floor line, draw a diagonal line at the end to cut the three side heights into right angles, and then check the production completion. (Floor overlooking * isosceles trapezoid)