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Areas of Circles & Sectors
Thm 11.7 – Area of a Circle – A = r2 * Remember to square the radius 1st, then multiply by !
Ex: Find the area of circle C. A = r2 A = (3)2 A = 9 cm2 OR 28.27 cm2 C 3 cm
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.
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.
Thm 10-12 – Area of a Sector –
Ex: Find the area of the small sector shown. 135o 1 1 m
Ex: L & M are 2 pts. on a circle R with r=50 cm & mLRM=150o. Find the areas of the sectors formed by LRM. 150o I II L M R 5 0 c m
Ex: Find the area of the shaded region. 4 c m r 2 4 c m 30o 2 2ð3 4ð3 (4) 2 16 16 - 12ð3 = 29.5 cm2
Homework Answers P. 570 P 28. 6 4. /9
1. A circle graph has a section marked “Potatoes: 28%.”
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1.7 Composite Figures A composite figure is formed from two or more figures. To find the area of a composite figure: Find the areas of each figure then.
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Section 7-7 Circles and Sectors SPI 32L: determine the area of indicated regions involving circles SPI 33B: find the area of a sector of a circle given.
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L.E.Q. How do you find the areas of circles, sectors, and segments of circles?
7.7: Areas of Circles and Sectors
10.7 Areas of Circles and Sectors
Section 7 –7 Areas of Circles & SEctors
Circumferences and Areas of Circles COURSE 3 LESSON 8-8 The diameter of a small pizza is 24 cm. Find its area. Round to the nearest tenth. A = r 2 Use.
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