A rectangle with a semicircle attached to it is a shape known as a semicircular cylinder. A semicircular cylinder is a three-dimensional shape that is made up of a cylinder with a circular base and a semicircular top.
The base of the semicircular cylinder is a rectangle, and the top of the cylinder is a semicircle. The two sides of the cylinder are curved, and they connect the rectangular base to the semicircular top.
Semicircular cylinders have a number of important properties, including their volume and surface area. The volume of a semicircular cylinder is given by the formula V = pi * r^2 * h,
where V is the volume,
r is the radius of the semicircle, and
h is the height of the cylinder.
The surface area of a semicircular cylinder is given by the formula
A = 2 * pi * r * h + 2 * pi * r^2,
where A is the surface area and
r and h are as above.
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