Pentagonal Pyramid/ Radial Line Method/ Development Of Lateral Surface of Solids

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7. A regular pentagonal pyramid of side of base 35mm and altitude 65mm has its base on HP with a side of base perpendicular to VP. The pyramid is cut by a section plane which is perpendicular to VP and inclined at 30° to HP. The cutting plane meets the axis of the pyramid at a point 30mm below the vertex. Obtain the development of the remaining part of the pyramid.
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Thank you sir . It really helps me a lot !

sukhrajbrar