The shape you are describing is called a "stadium" or a "racetrack" shape. It consists of a rectangle with two semicircles attached at each end. This shape is often used in architecture and engineering for design and structural purposes.
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I think you are referring to an Obround, which is a shape consisting of two semicircles connected by parallel lines tangent to their endpoints (or a rectangle with half a circle on each end)
You can make a tube (or pipe) by using a rectangle and bending it around on itself. With two circles, you can close of each end of the tube to make a cylinder.
My guess would be a cylinder.
Perimeter is the length of a closed line around an area. A rectangle is an area. If each long side of the rectangle is 12 cm and each end of the rectangle is 9 cm, the total length is 14+14+9+9 or 46 cm.
Well, darling, that's what we call a "ray". It's like a line that decided to show off and grow a pointy edge on both sides. So, next time you see a line feeling fancy with arrows, just remember it's called a ray.
A destroyed angle is called to as a rect-angle. It's a pun on the "wreck"tangle