The answer depends on what you mean by correct [and incorrect].
1
4
4 triangular lateral faces
It has four triangles
Triangular is the correct spelling. T-r-i-a-n-g-u-l-a-r
The apex.
6
triangular prism triangular prism * * * * * The correct answer is an octagonal pyramid.
The correct spelling is pyramid (any of several triangular solids).
The correct spelling is pyramid (a solid with triangular faces).
the new food pyrmaid
a prymaid has 4 sides