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Circumference and Area of a Circle and a Sector

Geometry and Measures Circumference and Area of a Circle and a Sector

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Definition of Pi (π): the ratio of a circle’s circumference to its diameter.
Pi (π): An infinite, non-repeating decimal (approximation: π ≈ 3.14).
Circumference (C) and Area (A) of a circle: formula and examples.
Circle sector and central angle: definitions and examples.
Arc length and area of a circle sector: formula and examples.

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Diagram of the relationship between pi (?) and circumference, with a rolling wheel illustrating the circumference as ? times the diameter, C = ?d.

Circumference of a circle formula using C = 2?r, with an example that r = 5 cm, calculating circumference as 31.4 cm.? is shown as approximately 3.14.

Area of a circle formula A = ?r², with an example that the radius is 3 cm. The area is calculated as approximately 28.26 cm².

Diagram for circle sector, formulas for arc length and area of a sector are given as ?/360 multiplied by 2?r and ?/360 multiplied by ?r² respectively.

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