Notes 5.3 – Circumference and Area of Circles

Circle – the set of all points in a plane equidistant from a given point in the plane (center)

Radius – the distance from the center to the edge of a circle

Chord – a segment of a circle

Diameter – a segment (chord) that passes through the center of a circle

-- d = 2r

(pi) – a symbol representing the ratio between the circumference and the diameter of a circle

or or use on your calculator

Formulas

Circumference:

Area:

** Make sure you read the directions in order to leave your answer in terms of or to round the nearest tenth or hundredth.