What figure has exactly 4 lateral faces that are triangles?
http://www.mathsisfun.com/geometry/square-pyramid.html
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Triangular
4lateral faces
To find a figure with exactly 4 lateral faces that are triangles, we can think about the properties of different three-dimensional shapes. The figure that fits this description is a pyramid.
A pyramid has a polygon base and triangular faces that connect the vertices of the base to a single point called the apex. In the case of a pyramid with 4 lateral faces that are triangles, the base must be a square.
To verify this, you can visualize a pyramid in your mind or use a physical object like a dice as an example. Look for a shape where one point comes to a single apex, and the base is a square. Count the number of lateral faces that are triangles, and you will see that there are exactly 4.