A business may not provide you with a service or benefit if you donât provide your number. Sometimes you will have to share your number. Your employer and financial institutions need your SSN for wage and tax reporting purposes.
An arc is a portion of the circumference of a circle. In the figure above, the arc is the blue part of the circle. Strictly speaking, an arc could be a portion of some other curved shape, such as an ellipse, but it almost always refers to a circle. To avoid all possible mistake, it is sometimes called a circular arc. A straight line is drawn between the end points of the arc would be a chord of the circle. If the arc length is exactly half the circle, this called a semicircular arc. See Semicircle definition.
Geometry. any unbroken part of the circumference of a circle or other curved line. Also called electric arc. Electricity. a luminous bridge formed in a gap between two electrodes. Compare spark1 (def 2). Astronomy. the part of a circle representing the apparent course of a heavenly body.