Final answer:
A regular tetrahedron has 6 edges.
Step-by-step explanation:
A regular tetrahedron is a three-dimensional shape with four equilateral triangular faces.
Each face shares an edge with each of the other three faces.
To find the number of edges in a regular tetrahedron, we can count the number of edges for each face and divide by 2 (since each edge is shared by two faces).
Since each face of a tetrahedron is an equilateral triangle, it has three edges. So, the total number of edges in a tetrahedron is:
Number of edges = (Number of faces x Number of edges per face) / 2
Number of edges = (4 x 3) / 2 = 6