An arc is a portion of the circumference
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An arc is a portion of the circumference of a circle.
A part of the circumference is called an arc. If the circumference is split into two unequal arcs then the larger portion is referred to as the major arc and the lesser portion as the minor arc.
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In geometry, an arc is a curved portion of a circle. It is defined by two endpoints and the points along the circumference of the circle that lie between the endpoints. The measure of an arc is typically given in degrees.
Circumference = 2pi*r Circumference = 86pi