The methoid of obtaining the development of a truncated prism is shown in figure 1.

Figure1. shows the development of a truncated rectangular prism.

Step 1: Draw the stretch-out line in the front view, along the base of the prism and equal in length to the perimeter of the prism. 
Locate the fold lines on the pattern along the stretch-out line equal in length to the sides of the prism, 1-2, 2-3, 3-4, and 4-1.
Draw perpendicular construction lines at each of these points.
Project the points 1, 2, 3, and 4 from the front view
Step 2: Darken lines 1-2-3 and 4-1. Construct the bottom and top, as shown and add the seam to one end of the development and the top and bottom 

The Procedure for obtaining the development of a cylinder is illustrated in figure 2.

Figure 2. Shows the step wise procedure for obtaining the development of a cylinder.

Step 1. In the front view, draw the stretch-out line aligned with the base of the cylinder and equal in length to the circumference of the base circle.
At each end of this line, construct vertical lines equal in length to the height of the cylinder.
Step 2. Add the seam to the right end of the development, and add the bottom and top circles.