A triangular based pyramid has no lines of symmetry.
However, if each of the non-base triangular sides are equal it will have 3 planes of symmetry.
If the base triangle is also equal, it will have 6 planes of symmetry.
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Square Pyramid has a square base and 4 triangular sides. Triangular Pyramid has a triangle base and 3 triangular sides.
A cylinder is a polygon that has circles as its base. A triangular pyramid is a polygon that has a triangle as its base.
base is triangular
In geometry, pyramid has many forms such as rectangular pyramid, trapezoidal pyramid, quadrilateral pyramid and even triangular pyramid. Triangular pyramid is a pyramid with triangular base and can be called as a tetrahedron if each of its faces has congruent equilateral triangles.