square based pyramid
triangle based pyramid
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
pyramid
No. For example the triangles with sides {3, 4, 5} and {6, 8, 10} are similar but not congruent.
square based pyramid
A triangular prisim (3 faces on sides, one face on bottom).
An equilateral triangular pyramid
triangle based pyramid
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
pyramid
A REGULAR SQUARE PYRAMID.
yes, 2 pairs of congruent faces which are the 4 triangles in the triangular based pyramid:)
A tetrahedron has four equilateral triangles as sides
No. For example the triangles with sides {3, 4, 5} and {6, 8, 10} are similar but not congruent.
The tetrahedron has 4 equilateral triangles as its faces.
A tetrahedron; a shape made of four triangles.