Area and Circumference of a Circle Reference Sheet Vocabulary: Center of a Circle -­‐ a point in the circle and is at equal distance from all points on the circumference
Radius – a line segment with one endpoint on the center and the other end point on the circle or
circumference.
Diameter -­‐ a line segment that passes through the center of a circle and has endpoints on the circle.
Pi -­‐ 𝝅 = 3.14
Center Diameter ∙ Radius Formulas
Circumference Formula Distance around the circle Area Formula Area of a Circle is the amount of space occupied by the circle A = 𝝅 𝒓𝟐 C = 2r𝝅 or d𝝅 Surface Area of a Cylinder Surface Area Formula r h SA = h * 2r𝝅 + 2𝝅𝒓𝟐