Given two points on an arc (x0,y0) and (x1,y1) and the angle between them, alpha.
Return the centre of the circle and the radius.
The centre is (0,0) and the radius is 1.
Number of Circles in a Number
Back to basics 22 - Rotate a matrix
Volume of a sphere given its surface area
Squares in Squares - Concentric Squares
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