查看完整版本 : 請問可否solve呢兩條THX

ff7fans 2017-7-23 06:16 PM

請問可否solve呢兩條THX

請看附圖thx[attach]7121509[/attach]

Jonleefun 2017-7-24 07:45 AM

I can give you some hints if you do not mind.  It will take me for ever to type the answer.

Please let me know if this works for you.

ff7fans 2017-7-24 07:51 AM

[quote]原帖由 [i]Jonleefun[/i] 於 2017-7-24 07:45 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=465007851&ptid=26809230][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
I can give you some hints if you do not mind.  It will take me for ever to type the answer.

Please let me know if this works for you. [/quote]


Please give me the hints

Jonleefun 2017-7-24 08:29 AM

Q13
1. plot the four points A, B, C, D on the graph.  Do not need to be very precious, we just to see where are they.
2. Find out the slope of AD
3. Find out the slope of CD
4. As aABCD is a parallelogram, AB//CD and AD//BC
5. Find the formula of the line AB, which has the same slope as CD, and pass through pint A
6. Find the formula of the line BC, which had the same slope as AD, and pass through point C
7. Once we have the equations of AB, and BC, solve the two equation to find the intersection, point B

Hope this help

Jonleefun 2017-7-24 08:37 AM

Q14.
1. Find the point P, which is the mid point of A,B.  Point P should be (2.5, 3)
2. Similarly, find point Q, which is the mid point of B and C
3. Then, point R, which is the mid point of C and D
4. Then, point S, which is the mid point of D and A
5. Now, you should have co-ordinations of P, Q, R, S
6. Find slope of PQ, QR, RS, SP
7. If slope of PQ = Slope of RS AND slope of QR = Slope of SP
8. Then, PQRS is a parallelogram
9. If not, please check your work.

Hope this help

ff7fans 2017-7-24 08:49 AM

thx very much

Jonleefun 2017-7-24 09:01 AM

[quote]原帖由 [i]ff7fans[/i] 於 2017-7-23 04:49 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=465009443&ptid=26809230][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
thx very much [/quote]
you are welcome.
Hope these help.
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