warm-up after 7.8: geometry 7.9 area of circles & sectors€¦ · geom 03_07_17 sect 7_9 march...
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Geom 03_07_17 sect 7_9 March 07, 2017warm-up after 7.8:
1. Find the radius. 2. Find the length of AB
3. Find m QR
Geometry 7.9 Area of Circles & Sectors
Learning Target:I can evaluate the area of circles & sectors. [G.C.5]
Acircle = π r2
Area of a circle = π radius2
Area of a circle
** Remember to follow order of operations (do exponents before you multiply)
The diameter of a circle is 11cm. Find the area. 1.
2. The area of a circle is 158.3 yd2. What is the diameter?
Sector of a Circle- A region bounded by 2 radii of the circle and their intercepted arc.
sector APB
Area of sector = degrees in arc
Area of circle 360˚
3. Find the area of the sectors formed by ∠HJK.H
˚
m
Geom 03_07_17 sect 7_9 March 07, 2017
4. Find the area of C. 5. Find the area of the shaded region.
6 ft
18 ft
Assignment:7.9 worksheet