3條中一數學問題(附圖),thz

2012-08-06 8:41 pm

1.http://imageshack.us/photo/my-images/607/42886450986545903089767.jpg/

Q:Find the area of the shaded region PQRS.

2.http://imageshack.us/photo/my-images/163/52659150986551903089128.jpg/

Q:In the figure, the 4 smaller squares foem a lager square. Now join A , B , C and D with O respectively , and calculate the sum of 4 angles AOP, BOP
, COP and DOP.

3.http://imageshack.us/photo/my-images/502/53019050986537569757283.jpg/

Q:Referring to the figure, write down a pair of similar triangles and give reasons.

回答 (1)

jinyao

2012-08-07 6:29 am

✔ 最佳答案

1. the area of the shaded region PQRS is:
(10*10-3*4)/2=44cm²

2. since AOP=ODP and ODP+DOP=90〬
and also BOP=COP=45〬
so AOP+BOP+COP+DOP=180〬

3. FAR and RBH

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