a four faced triangle is called a tetrahedron
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A four-faced solid is called a tetrahedron.
A triangular pyramid, i.e. a pyramid with only 4 faces and each face a triangle, is called a tetra-hedron. this is because the word tetra-hedron (Greek in origin) has the following meaning: tetra = 4 hedron = faced so a tetrahedron is a four-faced object - the only four faced object is the triangular pyramid.
Pyramid
A rhombus has four sides, a triangle has three.A rhombus has four sides, a triangle has three.A rhombus has four sides, a triangle has three.A rhombus has four sides, a triangle has three.
no triangle do not have four congruent angles