Pentagonal Pyramid Projections | Step-by-Step Construction on Grid Sheet | CAED

Learn to construct the orthographic projections of a pentagonal pyramid using a scale, compass, protractor, and pencil on a grid sheet. This beginner-friendly lesson explains each construction step with Indian male English narration—from drawing a regular pentagon to completing the final front and top views using first-angle projection. PROBLEM A pentagonal pyramid of base side 25 mm and axis length 60 mm rests on one of its base edges on HP. Its apex is 40 mm above HP, and its axis is inclined at 30° to VP. Draw its orthographic projections. WHAT YOU WILL LEARN • Understanding HP, VP, XY, and first-angle projection • Constructing a regular pentagon with 25 mm sides • Finding its centre using compass constructions • Drawing the initial top and front views • Tilting the pyramid about its resting base edge • Positioning the apex 40 mm above HP • Satisfying the true 30° inclination of the axis to VP • Identifying visible and hidden edges IMPORTANT DISTINCTION The true 30° inclination to VP is different from the angle of the top-view axis to XY. This lesson demonstrates the construction needed to obtain the correct final position. CHAPTERS 00:00 Problem explained 00:31 HP, VP, and first-angle projection 02:05 Constructing the pentagonal base 04:33 Finding the base centre 05:35 Drawing the initial front view 06:36 Constructing the 40 mm apex-height locus 08:11 Obtaining the tilted top view 08:45 Understanding the true angle to VP 09:15 Constructing the auxiliary triangle 09:48 Finding the final plan-axis direction 10:24 Rotating the complete top view 10:58 Projecting the final front view 11:21 Visible and hidden edges 11:54 Checking the completed solution 12:30 Three-stage solution recap Keep your drawing instruments ready. Pause after each step and complete the construction on your own sheet before continuing. #CAED #EngineeringDrawing #ProjectionOfSolids