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When the axis of the pyramid is perpendicular to its base, which pyramid does it represent?

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When the axis of the pyramid is perpendicular to its base, which pyramid does it represent?

(a) Perpendicular pyramid

(b) Square pyramid

(c) Oblique pyramid

(d) Right pyramid

The question was asked in an online interview.

I'm obligated to ask this question of Projections of Solids topic in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

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Right choice is (d) Right pyramid

The best explanation: A right pyramid is a pyramid with a base that is a regular polygon and whose apex is directly above the centre of the base. The surface area of a right pyramid can be calculated, using. the following formula: SA 5 B 1. Ps, where B is the area of the base, P is the perimeter of the base, and s is the slant height.

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