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Jericob · Answer 1 · 2018-03-28T13:56:03+0000

No radius = no circle
The radius defines how big a circle is.
0 radius means the circle is only a dot.
So, the area of the circle is 0.

Or technically, algebraically --
area = πr²
area = π(0)²
area=π(0)
area = 0

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