Circle - The distance around the boundary of a circle is called the circumference., Radius - the distance from its center to any point on its circumference (or surface), Chord - a straight line segment connecting two points on a circle's circumference, or more generally, on any curve, Diameter - The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circumference of the circle., Secant - a line that intersects a circle (or any curve) at two distinct points, Tangent - Is a line touching circles or an ellipse at only one point., Part of Tangency - the single point where a tangent line touches a curve (like a circle or other plane curve) without intersecting it, Central angle - An angle formed at the center of a circle with end points on the circle's edge (circumference)., Inscribed angle - An angle made from points sitting on a circle's circumference., ARC - In mathematics, an arc is defined as a portion of the boundary of a circle or a curve. It can also be referred to as an open curve., Minor ARC - a portion of a circle's circumference that measures less than 180 degrees (or half the circle) and is the shorter arc connecting two points on the circle's circumference, Major ARC - the longer arc connecting two points on a circle, measuring greater than 180 degrees (or more than half a circle, Semicircle - is half of a circle. It is a 2D shape formed when a circle is cut into two equal parts. We can create two semi-circles from any circle,

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