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
triangular prism triangular prism * * * * * The correct answer is an octagonal pyramid.
6
The apex.
The correct spelling is pyramid (any of several triangular solids).
The correct spelling is pyramid (a solid with triangular faces).
a prymaid has 4 sides
the new food pyrmaid