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# Rules Relative To The Circle

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Starrett- Rules of the circle..great for layout

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### Rules Relative To The Circle

1. 1. REFERENCE TABLES .000 Rules Relative to the CircleTo Find Circumference Square– Multiply diameter by 3.1416 – A side multiplied by 1.4142 equals diameter of its– Or divide diameter by 0.3183 circumscribing circle – A side multiplied by 4.443 equals circumference of itsTo Find Diameter circumscribing circle– Multiply circumference by 0.3183 – A side multiplied by 1.128 equals diameter of an equal side– Or divide circumference by 3.1416 – A side multiplied by 3.547 equals circumference of an equal circleTo Find Radius– Multiply circumference by 0.15915 To Find the Area of a Circle– Or divide circumference by 6.28318 – Multiply circumference by one-quarter of the diameter – Or multiply the square of diameter by 0.7854To Find Side of an Inscribed Square – Or multiply the square of circumference by .07958– Multiply diameter by 0.7071 – Or multiply the square of 1/2 diameter by 3.1416– Or multiply circumference by 0.2251– Or divide circumference by 4.4428 To Find the Surface of a Sphere or Globe – Multiply the diameter by the circumferenceTo Find Side of an Equal Square – Or multiply the square of a diameter by 3.1416– Multiply diameter by 0.8862 – Or multiply four times the square of radius by 3.1416– Or divide diameter by 1.1284– Or multiply circumference by 0.2821– Or divide circumference by 3.545