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11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 1
March 07, 2012
Bellwork
about 56.5 cm. 8.64 cm
100.53 cm
7.64 ft
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 2
March 07, 2012
A circle has an area of ≈ 38.485 in2. What is the circumference of the circle?
11.5 Areas of Circles & Sectors
Area of Circle = πr2 (fuzzy wuzzy)
4.2 m
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 3
March 07, 2012
20 in
Find the area of the shaded region.
10 cm
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 4
March 07, 2012
Sector of a Circle:region bounded by 2 radii of a circle & the included arc
Formula for the Area of a Sector:“portion of the circle times the area of the circle”
Asector = x360
πr2
r = 3 cm
120 o
r = 6cm
60o
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 5
March 07, 2012
Segment of a Circle:region bounded by a chord of a circle & the included arc
r = 8 cm
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 6
March 07, 2012
Annulus:region bounded by two concentric circles
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 7
March 07, 2012
R = 12cmr = 9 cm
r
60o
R
The shaded area is 12π cm2. Find r.
r
120o
11.5 Area of Circles & Sectors
HW pg. 758 #331 odds 8
March 07, 2012
11.5 HW pg. 758 #3-31 odds