a) Area of the shaded interior circle, not in triangle ABC b) Area of the sector of the circle that makes up angle BAC c) length of the arc of the circle that forms the central angle BAC

Two-dimensional figure measured in terms of radius. It is formed by a set of points that are at a constant or fixed distance from a fixed point in the center of the plane. The parts of the circle are circumference, radius, diameter, chord, tangent, secant, arc of a circle, and segment in a circle.