If you cut a rectangle in half you wouldn't get a solid figure at all, since a rectangle is a plane figure. If you made a straight line cut you would get either a triangle or a quadrilateral of some variety depending on exactly how the cut was made.
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Dome
Another cylinder
A rectangular prism or a cuboid.
If it was a square, the answer would be 81 square cm. The area will be the product of two numbers whose sum is half the perimeter.
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