4. In the figure, AOB is a sector with radius 5 cm. Find the area of the shaded region.
p:
http://www.flickr.com/photos/29635386@N06/3425664389/
Area and Volumes
2009-04-10 5:24 am
回答 (1)
2009-04-10 5:45 am
✔ 最佳答案
4.The area of the shaded region=π(5)2(90/360)- 1/2(5)(5)=25π/4 - 25/2
=7.13cm2(準確至3位有效數字)
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