In the figure, ABCD is a parallelogram. AD and CB are produced to H and E respectively, such that AD : DH = 2 : 1 and EB : BC = 1 : 3. EH cuts AB and CD at F and G respectively. Find EF : GH.
https://www.flickr.com/photos/130230543@N06/15508148053/in/photostream
A.1 : 2
B.2 : 1
C.2 : 3
D.3 : 2
(Answer is C)
The figure shows a sector OAB with centre O, with radius 8 cm and chord AB 6 cm. What percentage of the sector is shaded? (Give the answer correct to 3 significant figures.)
https://www.flickr.com/photos/130230543@N06/15940863208/in/photostream
A.9.56%
B.9.83%
C.11.2%
D.12.3%
(Answer is A)
S4_Mock02_E
2014-12-29 6:23 am
回答 (2)
2014-12-29 6:41 am
✔ 最佳答案
Please read:圖片參考：https://s.yimg.com/rk/HA00430218/o/1286536996.png
2014-12-28 23:11:25 補充：
For Question 1, yes you can do it your way.
For Question 2, I think you must use a calculator even you use Heron's formula.
2014-12-29 9:00 am
since ABO is a isos. triangle
U can divide it into 2 Congruent triangle
No need use cos law and heron's formula
U can just use pyth. theorem find the height and then area!
U can divide it into 2 Congruent triangle
No need use cos law and heron's formula
U can just use pyth. theorem find the height and then area!
參考: ME!
收錄日期: 2021-04-15 17:43:21
原文連結 [永久失效]:
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