Development of Lateral Surfaces of Solids Pentagonal Pyramid 02

A pentagonal pyramid 30 mm sides of base and 50mm height rests vertically with one of its base edges parallel to VP and nearer to it. It is cut by a plane passing through the extreme right corner of the base of the pyramid and inclined at 30° to HP and perpendicular to VP. Draw the development of upper portion of the pyramid.

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Hello sir you explain very nice but also explain isometric projection plz