Circular Arc Layout

Radius = 25 Chord = 4 Chord ÷ 2 = 2 y ² = R ² – x ² y ² = 25 ² – 2 ² y = 24.91987 h = R – y h = 25 – 24.91987 h = .08013 (Side of Jig Triangle) ² = x ² + h ² (Side of Jig Triangle) ² = 2 ² + .08013 ² Side of Jig Triangle = 2.00160 Central Angle ÷ 2 = arcsin ( 2 ÷ 25 ) = 4.58857° Angle at Jig Apex = 180° – 4.58857° = 175.41143°

Radius = 50 Chord = 4 Chord ÷ 2 = 2 y ² = R ² – x ² y ² = 50 ² – 2 ² y = 49.95998 h = R – y h = 50 – 49.95998 h = .04002 (Side of Jig Triangle) ² = x ² + h ² (Side of Jig Triangle) ² = 2 ² + .04002 ² Side of Jig Triangle = 2.00040 Central Angle ÷ 2 = arcsin ( 2 ÷ 50 ) = 2.29244° Angle at Jig Apex = 180° – 2.29244° = 177.70756°