a radar uses a "parabolic" dish to capture the radio waves and because the shape is concave the waves hit the centre of the dish, the receiver is placed away from the centres facing the dish where the waves are reflected to it. The classic example is satellite dish receivers
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None, but we have a couple square-shaped.
There are various reasons that manholes are shaped like a circle. For example, it is much easier to dig a circular hole.
the earth is a sphere but if you look at it as a 2d shape it is a circle
A circle perhaps
So everybody's facing the action in the middle.