The Pyramid and the Cone

Applied Mathematics — Second Secondary

Common mistakes

Comparison aspect	Main idea	Keywords
Mistake	confusing the true height with the slant height. Correct: the true height is perpendicular to the base while the slant height lies on a lateral face and is longer than the height	confusingtrueheightslant
Mistake	using the side length in place of the distance from the centre of the base to the midpoint of a side in l² = h² + m². Correct: m is the distance from the centre of the base to the midpoint of a side not the side itself	usingsidelengthplace
Mistake	applying l² = r² + h² to a pyramid instead of a cone. Correct: this relation applies to a cone whose base is a circle of radius r	applyingpyramidinsteadcone

The Pyramid and the Cone · 6 / 7