Finding the Area and Circumference of a Circle

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Finding the Area and Circumference of a Circle:

Finding the Area and Circumference of a Circle

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Center – The exact middle of the circle *The Green dot*

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Diameter – A line going THROUGH the center of a circle *The Red Line*

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Radius – A line going from any point on the circle to the center. *The Orange line*

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Circumference – The distance AROUND the outside of the circle

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Area – The entire INSIDE of the circle

Formulas:

Formulas Circumference of a Circle: C = 2 r OR d Pi =

Example One – Finding Area:

Example One – Finding Area 5 cm Radius = 5 cm A = x 25 A = 78.5

Example Two – Finding Area:

Example Two – Finding Area 12 m Diameter = 12 m Radius = Diameter / 2 Radius = 12 / 2 = 6

Example Three – Finding Circumference:

Example Three – Finding Circumference 6 in C = 2 r Radius = 6 in C = 2 x 6 C = 37.68 in

Example Four – Finding Circumference:

Example Four – Finding Circumference 15 F T C = d Diameter = 15 FT C = x 15 C = 47.1 FT

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