Because there are 540 interior degrees in a five sided figure and the total sum of three triangles is 540 degrees
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They are called polygons
In general, a parallelogram. But if the triangles are joined along their odd side, a rhombus.
a geometric shape made up of 20 triangles. :)
A triangle that can be made in more than one way
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.