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Hemisphere.
A ten-sided polygon is called a decagon.
You can't make a 4 sided shape with a total of 207
Just draw it out. Draw a square with a 3-4-5 right triangle abutting it, laying on its long side with it's short side against the square. The length of the base of the triangle should be about half the length of the square's side. Trace the perimeter of these two objects, and you will get a 5 sided object with: three right edges of a square, with an obtuse angle coming off the side and an acute, reflex angle at the tip of the right triangle.
A right sided triangle.http://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Triangle-right.svg/460px-Triangle-right.svg.png