The square ABCD , each side 10cm, OPQR is a sector, OD=OC=5 cm
a. Find length of OP.
B. Find angle POD
c. Find the area of shaded region..
DIagram: http://www.flickr.com/photos/51470019@N07/5029361336/
PLS help.thx.
trigo
2010-09-28 1:13 am
回答 (1)
2010-09-29 1:04 am
✔ 最佳答案
a)OP=OQ=AD=10cm
b)
In tri. OPD,
cos (angle POD)=5/10=1/2
angle POD=60 degree
c)
Angle POR=180-60-60=60
Shaded Region
=Area of sector OPQR-Area of tri. OPR
=(60/360)*pi*(10^2)-(1/2)(10)^2sin60
=(50pi/3-50sqrt3/2)cm^2
收錄日期: 2021-04-22 00:53:39
原文連結 [永久失效]:
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