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The perimeter of a circle is called its circumference. The circumference of a circle can be calculated as;
Circumference = 2*pi*R
Circumference = 80 pi
80 pi = 2*pi*R
Dividing by pi on both sides;
80 = 2R
R= 80/2 = 40
The area of a circle is;
Area of circle = pi*R2
Area of circle = 3.14* 402
Area of circle = 3.14* 1600
Area of circle = 5024 units
Circumference = 2*pi*R
Circumference = 80 pi
80 pi = 2*pi*R
Dividing by pi on both sides;
80 = 2R
R= 80/2 = 40
The area of a circle is;
Area of circle = pi*R2
Area of circle = 3.14* 402
Area of circle = 3.14* 1600
Area of circle = 5024 units
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