Which is NOT one of the three main pyramid types described?

• A. Dome pyramid
• B. Step pyramid
• C. Bent pyramid
• D. Straight sided pyramid

Answer: (A)

The question tests recognizing the standard forms used to describe pyramids in this context: Step pyramids, Bent pyramids, and Straight-sided (true) pyramids. A dome pyramid isn’t part of that established set because pyramids are classified by their exterior profile of flat faces meeting at an apex. The Step pyramid shows a staircase-like, tiered design built from stacked mastabas; the Bent pyramid is notable for its two different slopes, reflecting a transition in engineering and geometry; the Straight-sided pyramid has smooth faces that form a true pyramid with a single apex, exemplified by the classic smooth-faced pyramids such as the Great Pyramid. Since a dome structure would require curved surfaces rather than flat, planed faces forming a true pyramid, it doesn’t fit the standard trio, making it the not-one-of-them choice.