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Linear Measurement

12 inches = 1 foot. 3 feet = 1 yard. 1 mile = 1760 yards = 5280 feet = 63,360 inches.

Inches expressed in Decimals of a Foot. 5. To find the length of an arc of a circle, when the cord of the whole arc and the chord of onehalf of the arc are known, from 8 times the chord of one-half the arc, subtract the chord of the whole arc: one-third of the remainder will be the length of the arc nearly. 6. Periphery of an elipse. Multiply the square root of the sum of the squares of the axes by 2.22.