Mathematics for IGCSE & O level - Mensuration (Section 11 - No. 49)
What is a 'frustum' in the context of 3D shapes?
A shape with parallel sides
The portion of a cone or pyramid remaining after the top is cut off
A curved shape
A 3D shape with 6 faces
Explanation
A frustum is what's left when the top of a cone or pyramid is removed by a plane parallel to the base.