Area = pi*132 = 530.9291585 or 531 square cm
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The circumference of a circle if its radius is 13cm is: 81.68 cm
tell what the diameter (d) and radius(r) of each circle is by using this information
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386