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pi*radius2 = 169*pi Divide both sides by pi then square root both sides to find the radius: radius = 13 and 2*13 = a diameter of 26 cm
Area of a circle = pi*radius squared Circumference of a circle = 2*pi*radius or diameter*pi
2*pi*radius = perimeter or circumference of a circle radius = circumference/2*pi
Circumference of a circle = 2*pi*radius or diameter*pi
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared Radius of a circle = diameter/2 Degrees around a circle = 360 degrees