Which simple solid looks like a square from above, a triangle from the front, and a triangle from the side?

pyramid with square base.

Step-by-step explanation:

We have been given some description about a simple solid which looks like a square from above, a triangle from the front, and a triangle from the side.

Now we need to figure out which solid has above properties.

The answer will be pyramid with square base. Because side walls of pyramid are always in same shape.