Which solid has one base that is a triangle and three lateral surfaces that are triangles

Question

1. triangles pyramid
2. triangles prism
3. rectangular prism
4. rectangular pyramid

Answer 1

1. Triangle pyramid

Answer 2

explain

Answer 3

A triangle pyramid is a solid geometric shape that has a triangular base and three lateral triangular surfaces that converge at the apex of the pyramid. The triangular base can be equilateral, isosceles or scalene, but it always has three sides forming a triangle shape. The lateral triangular surfaces are congruent and will always intersect at a single point above the base, forming an apex. The shape of a triangle pyramid can vary depending on the dimensions of the base and the height of the pyramid.