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HOME-ROOM

HOME-ROOM. BELL-WORK. TB pg 777 #15. CW 4.1 Review. TB pg 767 # 1,3,4,5,7,9. HW 4.1(c). Due 03/22/19: PW 11-3 (odd). HW 4.1(b) Solutions. 187 cm 2 112 ft 2 20 cm 2 20m, 40m 10. a. 6¾ in 2 b. 4 ½ in., 3 in. Guiding question:. How is the area of circles and sectors found?. Area.

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HOME-ROOM

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  1. HOME-ROOM

  2. BELL-WORK TB pg 777 #15

  3. CW 4.1 Review TB pg 767 # 1,3,4,5,7,9

  4. HW 4.1(c) Due 03/22/19: PW 11-3 (odd)

  5. HW 4.1(b) Solutions 187 cm2 112 ft2 20 cm2 20m, 40m 10. a. 6¾ in2 b. 4 ½ in., 3 in.

  6. Guiding question: How is the area of circles and sectors found?

  7. Area Now that we can find the area of any triangle and quadrilateral, we will now examine the area of circles and sectors.

  8. Area of a Circle If a circle

  9. Area of a Circle If a circle is split into congruent pieces

  10. Area of a Circle If a circle is split into congruent pieces and is arranged as shown

  11. Area of a Circle If a circle is split into congruent pieces and is arranged as shown, a parallelogram is formed.

  12. Area of a Circle If a circle is split into congruent pieces and is arranged as shown a parallelogram is formed. Since half of the circle pieces form the base of the parallelogram, that length is ½C.

  13. Area of a Circle If a circle is split into congruent pieces and is arranged as shown a parallelogram is formed. Since half of the circle pieces form the base of the parallelogram, that length is ½(2∏r).

  14. Area of a Circle If a circle is split into congruent pieces and is arranged as shown a parallelogram is formed. Since half of the circle pieces form the base of the parallelogram, that length is ½(2∏r). Notice that the height of the parallelogram is a radius.

  15. Area of a Circle Therefore the area of the circle is ½(2∏r)∙r.

  16. Area of a Circle Therefore the area of the circle is ½(2∏r)∙r. Area of a circle = ∏r2

  17. Area of a Circle An outdoor accessories company manufactures circular covers for outdoor umbrellas. If the cover is 8 inches longer than the umbrella on each side, find the area of the cover in square inches to the nearest square inch. TB pg 782 Guided Practice 1 TB pg 783 Guided Practice 2

  18. Area of a Sector A sector of a circle is a region of a circle bound by a central angle and its intercepted arc.

  19. Area of a Sector A sector of a circle is a region of a circle bound by a central angle and its intercepted arc.

  20. Area of a Sector A sector of a circle is a region of a circle bound by a central angle and its intercepted arc. Since the area of a sector is a portion of the area of a circle,

  21. Area of a Sector A sector of a circle is a region of a circle bound by a central angle and its intercepted arc. Since the area of a sector is a portion of the area of a circle, the area of a sector isθ∙ ∏r2 360

  22. Area of a Sector A pie has a diameter of 9 inches and is cut into 10 congruent slices. What is the area of one slice to the nearest hundredth? TB pg 784 Guided Practice 3A-D.

  23. Who wants to answer the Guiding question? How is the area of circles and sectors found?

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