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5.3 – Circumference & Area of Circles

5.3 – Circumference & Area of Circles. Circumference. Circumference The distance around a circle C = 2 π r This is a one-dimensional measurement!. Circumference. Area. Area of a circle The number of square units that fit inside a circle A = π r 2 This is a two-dimensional

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5.3 – Circumference & Area of Circles

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  1. 5.3 – Circumference & Area of Circles

  2. Circumference • Circumference • The distance around a circle • C = 2πr This is a one-dimensional measurement!

  3. Circumference

  4. Area • Area of a circle • The number of square units that fit inside a circle • A = πr2 This is a two-dimensional measurement!

  5. Area

  6. Be able to work backwards! • What is the radius of a circle whose circumference is 25.1 cm (round to the nearest hundredth)

  7. What is the diameter of a circle whose circumference is 84 yds (round to the nearest hundredth)

  8. Apply • What is the area of a circle whose radius is 4.23 meters?

  9. Be able to work backwards! • What is the radius of a circle whose area is 98.7 square feet? (round to the nearest hundredth)

  10. What is the diameter of a circle whose area is 579.568 square inches? (round to the nearest hundredth)

  11. Shaded Area • If part is shaded and part is unshaded … • Find the area of the BIG and subtract the area of the SMALL • If it is all shaded or all unshaded … • Find the area of the pieces and add it all together.

  12. Shaded Area

  13. Shaded Area

  14. Shaded Area

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