Arc
two points on a circle and the continuous part of the circle between the two points
An arc is a portion of a circle’s circumference. It is the curved part of the circumference that extends between two points on the circle. In other words, an arc is a part of the circle that is not the full circle.
The size of an arc is usually measured in degrees, just like the angles in a triangle. For example, a quarter of a circle has an arc of 90 degrees. If you know the radius and the central angle of the arc, you can calculate the length of the arc using the formula L = rθ, where L is the length of the arc, r is the radius of the circle, and θ is the central angle of the arc in radians.
Arcs are used in many areas of math and science, including geometry, trigonometry, and physics. For example, in physics, an arc is used to describe the trajectory of a projectile. In geometry, arcs are used to describe angle measures and to calculate areas of circles and sectors.
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