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Use the formula:
Angle = arctan(Rise ÷ Run)
Example:
Rise = 6"
Run = 12"
arctan(6 ÷ 12) = 26.57°
Rise = tan(Angle) × Run
Run = Rise ÷ tan(Angle)
Draw two chords anywhere on the circle. Construct a perpendicular bisector for each chord. Their intersection is the center of the circle.
Radius = (Chord² ÷ (8 × Rise)) + (Rise ÷ 2)
Circumference = π × Diameter
Diameter = Circumference ÷ π
Chord = 2 × Radius × sin(180° ÷ Number of Holes)
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