If you mean in a car engine, it's because an explosion (even a controlled one of the gasoline/petrol being ignited by a spark plug) creates a spherical force. So, the cylindrical piston is the same shape as the explosion, and gets the most efficient pressure distribution. A rectangular piston would get force in the middle, but not the edges, and it would take more force to do the same job. Also, the rectangular piston would wear down faster because of the uneven force being applied.
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12. but if you cant answer that your self, you apparently cant do your math!
that is impossible!!! you cant have 2 edges make a shape
No, there are more that triangular prisms. There are also rectangular prisms and one other that i cant recall.=-)
A 3 x 5 rectangle.
just cant