It is not possible to answer the question because the information which is provided does not enable you to distinguish between a "fat" but short prism or a thin long one.
a triangular cylinder
A pyramid
4 triangular lateral faces
It_is_a_triangular_prism.">It_is_a_triangular_prism.">It is a triangular prism.* * * * *While a triangular prism can have equilateral triangle faces, it has more faces that are quadrilateral (or rectangular).A polyhedron with only equilateral triangular faces could be a tetrahedron, an octahedron in the form of a square based dipyramid, or an icosahedron.
A square, a cube, a diamond, a equilateral triangle, a triangular based pyramid made of equilateral triangles...
both have lateral face shapes that are riangles
72 cm square.
It is the perimeter of a triangle times the length of the prism (in square units).
It works out as 12 cm
3 or 4 triangles, depending on whether it's a triangular or square base.
Area of equilateral triangle: 0.5*12*12*sin(60 degrees) = 187 square cm
Lateral area excluding the two end caps = 2*pi*radius*height Area = 2*3.14*2*90 = 1130.4 square centimeters