The base would be an octagon, or an eight sided polygon.
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Oh, dude, a square base pyramid is like the cool kid of shapes. It's got that square base, you know, four sides all equal and stuff, and then it's got this pointy top that's like, "Look at me, I'm a pyramid!" So, yeah, it's basically a square with a triangle on top, but way more awesome.
i need picture of triangal pyramid
A pyramid shape looks lyke a pyramid
You look all around until you find the bottom of it.
A pyramid with a triangle as base is considered as a tetrahedron. It is a three dimensional polyhedron with 4 equilateral triangles as its sides. If one would look at the word tetrahedron, it literally means "with four planes".