Question

a heptagon
a triangle
a parallelogram
a hexagon

Explanation:

🆕 New Concept Discovered: Cross Sections of Three-Dimensional Figures
Cutting 3D shapes to reveal 2D faces

Step 1: Identify the 3D solid and the slicing plane

The 3D solid shown is a hexagonal pyramid (a pyramid with a 6-sided base).

The red plane slices through the pyramid horizontally, parallel to its base.

Step 2: Determine the shape of the cross section

When a plane slices a pyramid parallel to its base:

• The resulting 2D cross section is a smaller version of the base shape.
• Since the base of this pyramid is a hexagon (6 sides), any horizontal slice parallel to the base will also be a hexagon.

Answer:

a hexagon