A unit circle is a circle with radius equal to one.
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The area of a 6 unit circle is: 28.27 square units.
A 1.4-unit diameter circle has an area of 1.539 square units.
The circumference is 27.646 units.
The area of a square with side x is x2 SQUARE units. A circle with diameter 1 unit, has an area of pi/4 square units. Since the area of a square with side of 1 unit is 1 square unit, let us call the area of a circle of diameter 1 unit to 1 circular unit. That gives 1 circular unit = pi/4 square units. So a square with sides of x units = x2 units = pi*x2/4 or pi*(x/2)2 units.
The area of a circle (to the nearest hundredth) with a 5-unit radius is: 78.54 square units.