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6.8 Areas of Circles & Sectors

6.8 Areas of Circles & Sectors. p. 230. Thm 6.20 – Area of a Circle –. A = r 2 * Remember to square the radius 1 st , then multiply by !. Ex : Find the area of circle C. A = r 2 A = (3) 2 A = 9 cm 2 OR 28.27 cm 2. 3 cm. C.

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6.8 Areas of Circles & Sectors

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  1. 6.8 Areas of Circles & Sectors p. 230

  2. Thm 6.20 – Area of a Circle – A = r2 * Remember to square the radius 1st, then multiply by !

  3. Ex: Find the area of circle C. A = r2 A = (3)2 A = 9 cm2 OR 28.27 cm2 3 cm C

  4. Ex: Find the diameter of circle C if the area is 16 ft2. A = r2 16 = r2 16 = r2 ð16 = r 4 ft = r So, d = 8 ft.

  5. Sector of a Circle • The region bounded by 2 radii & their intercepted arc. Sector Also a sector • Visually, it might remind you of a slice of pizza or a piece of pie.

  6. Thm 6.21 – Area of a Sector –

  7. Ex: Find the area of the small sector shown. 135o 11 m

  8. Ex: L & M are 2 pts. on a circle R with r=50 cm & mLRM=150o. Find the areas of the sectors formed by LRM. II R 50 cm L 150o M I

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