Question

The development of cylinder is a _______

(a) triangle

(b) rectangle

(c) square

(d) trapezium

This question was addressed to me during an interview.

This interesting question is from Development of Surfaces in portion Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing

Answer 1

Correct choice is (b) rectangle

Explanation: The figure above 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.