Which solid has one base that is a triangle and three lateral surfaces that are triangles
The solid is a triangular pyramid.
The solid that has one base that is a triangle and three lateral surfaces that are also triangles is called a triangular pyramid.
The solid you are referring to is called a triangular pyramid. It has one base that is a triangle and three lateral surfaces that are also triangles.
To understand this conceptually, think of a pyramid shape. The base of the pyramid is a triangle, which means it has three straight sides and three vertices or corners. On the sides of the pyramid, there are three additional triangular faces that connect the top vertex of the pyramid to each corner of the base triangle. These triangular faces are called the lateral faces or lateral surfaces.
If you want to visualize a triangular pyramid, you can also search on the internet for images or diagrams of it. This will give you a better understanding of its shape and structure.
To determine the properties or dimensions of a specific triangular pyramid, you would need to know more information such as the lengths of its sides or angles.