👉 A tetraedron is a 3-dimensional shape consisting of four equal-length sides, each of which is a regular polygon. The name "tetraedron" comes from the fact that it has 4 sides or edges. It's also known as a dodecahedron in geometry.
👉 A tetraedron is a three-dimensional shape consisting of five straight lines meeting at a point called the vertex. These lines are perpendicular and form a regular polygon, with each side having a length equal to the distance between two consecutive vertices.