Question

what three - dimensional figure has a total of 4 surfaces (the sum of the faces and base(s) together)? a(n) dropdown dropdown

Explanation:

Step1: Recall 3D figures' surfaces

A triangular pyramid (tetrahedron) has 4 triangular faces (including bases). A triangular prism has 2 triangular bases and 3 rectangular faces, total 5. A square pyramid has 1 square base and 4 triangular faces, total 5. A triangular pyramid (tetrahedron) has 4 surfaces. Also, a triangular pyramid is a type of pyramid with a triangular base.

Step2: Identify the figure

The three - dimensional figure with 4 surfaces is a triangular pyramid (or tetrahedron). Another way: a pyramid with a triangular base (triangular pyramid) has 4 faces (surfaces). Also, a tetrahedron (which is a triangular pyramid) has 4 triangular faces.

Answer:

triangular pyramid (or tetrahedron)