Main Circle Equations
Circumference of Circle = PI x diameter = 2 PI x radius where PI = = 3.141592… Area of Circle: area = PI r2 Length of a Circular Arc: (with central angle ) if the angle is in degrees, then length = x (PI/180) x r if the angle is in radians, then length = r x Area of Circle Sector: (with central angle ) if the angle is in degrees, then area = (/360)x PI r2 if the angle is in radians, then area = ((/(2PI))x PI r2 Equation of Circle: (Cartesian coordinates) for a circle with center (j, k) and radius (r): (x-j)^2 + (y-k)^2 = r^2 Equation of Circle: (polar...
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