Glossary 📚

Term	Definition
area	The size of a two-dimensional surface.
arc	A portion of the circumference of a circle.
annulus	A ring-shaped object.
chord	A straight line segment whose endpoints both lie on the circle.
circumference	The distance around the circle. It is the circle's perimeter.
centre	The point inside a circle that is the same distance from each point on the circle.
diameter	Straight line segment that passes through the centre of the circle and whose endpoints lie on the circle.
radius	The distance from the centre of a circle or a sphere to any point on the circle or a sphere.
ratio	A comparison of two numbers by division.
sector	A pie-shaped part of a circle.
segment	The part of a line that connects two points.