A shape with 3 sides is exactly triangular as for example an equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees that add up to 180 degrees.
the answer is tetrahedron
Tetrahedron
a triangular pyramid
a triangular based pyramid
tetrahedron
A triangular based pyramid
There are an infinite no of shapes that have exactly 4 triangular faces. The two commonest are a tetrahedron and an Egyptian pyramid. If the question is re-phrased to "What shape has exactly four faces, (all of which are triangular), then the only answer is a tetrahedron. An Egyptian pyramid has five faces - a square base and four triangular sides. It is regular (the apex is vertically above the center of the base) and the sides are isosceles.
It is a triangular prism.
A shape that has some triangular faces is a pyramid.
A triangular pyramid.
There is a musical instrument which is triangular in shape blocks are some times triangular in shape.
triangular prism