It is 1/2*base*height of the triangle.
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1. triangular prism it has 2 triangular faces. 2.triangular base pyramid, it has 5 triangular faces. 3. square base pyramid, it has 4 triangular faces.
A triangular prism has three rectangular faces and two triangular faces.
If you mean a triangular pyramid then it has four faces, one base and three sides.
A Hexahedron has no triangular faces. A Tetrahedron has 4 triangular faces. A octahedron has 8 triangular faces. A Icosahedron has 20 triangular faces. By:-Cherrylvr- :)
It is the sum of the areas of its four faces.