Depending on their shapes and sizes you can make plane shapes with 3 to 24 sides.
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A pyramid could be constructed from 4 or more triangles.
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
Absolutely. Any two congruent right triangles will form a rectangle, and if the right triangles are isosceles right triangles, they will form a square.
An hexagon or a 6 sided shape
A dodecagon is a 12 sided shape made from 10 triangles