Answer: The radar scans for object in all directions around itself. A plane shape that represents "all around" is a circle.
Answer: That's related to the fact that a circle is the set of all points that have the same distance from the center.
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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
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