A Pentagonal prism of side of base 20 mm and height 50 mm stands vert…

Question

A Pentagonal prism of side of base 20 mm and height 50 mm stands vertically on its base with a rectangular face perpendicular to V.P. A cutting plane perpendicular to V.P and inclined at 60° to the axis passes through the edges of the top base of the prism. Develop the lower portion of the lateral surface of the prism.

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