how to do this?



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triangle - sector of circle
= 32 - 25.136
= 6.864

i got

-1<x≤-1/2
3≤x<5

same with you. issit using the line method?

1/2 pi is 90 degree.
PQ=QR, so angle QPR = 45 degree which is 1/4 pi.
area of sector is 1/2 x 8^2 x 1/4 x 3.142

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Added on November 27, 2010, 12:14 pmmy solution:

2x^2 - 4x - 3 ≥ x
2x^2 - 5x -3 ≥ 0
(2x+1)(x-3)≥0
draw the inequality graph
x≤-1/2 , x≥3

x>-1 , x<5

therefore,
-1<x≤-1/2
3≤x<5

This post has been edited by bryanyeo: Nov 27 2010, 12:14 PM

how to find the angle of R?
i don't get it..can u explain how to find the area of triangle and circle?thanks =D

1/2 pi is 90 degree, so actually it's a right angle triangle. Just use 1/2 x base x height, which is 1/2 x 8 x 8

Owhhh okay thanks man =D

Guys for trigo, can you list out the pi value for 45,135,215 etc? I usually spend a lot of time figuring it out. Thanls

you mean when sketching the graph?

________________________________
If something is floating stationary on water,what does this imply?
the buoyancy force=weight of object?

eh guys .. another question .. permutations . add math . for combination or permutation ... how to know when to add or times ?

for me, that question depends on my luck...i just simply choose one between permutation or combination and if wrong, 3 marks fly away...nvm lo..


i think
permutation = got arrangement, cannot simply choose
combination = no need arrangement, can simply choose

there's a trick to that. if your calculator is 570, you can press Mode and select "Rad." that way, when you calculate angles, the values are in radians.

yes. this also means that buoyant force = weight of fluid displaced = weight of object

What bout this question?
answer given is C.
weird.why isn't it E.


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angle X pi/180

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Added on November 27, 2010, 1:03 pmi have the same ans with yours too

mayb the ans given is wrong?

This post has been edited by 1malaysia: Nov 27 2010, 01:03 PM

Thank Darren and 1malaysia!

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Added on November 27, 2010, 1:06 pmIsnt it supposed to be E?

This post has been edited by abang brother: Nov 27 2010, 01:06 PM

You forgot about the other explanation. The buoyant force can also be more than the weight of object. That causes the object to float on water as well.

This post has been edited by henry930821: Nov 27 2010, 01:20 PM

guys. 2B 1) the answer's 6 but i cant seem to get the answer. I keep getting n>7. Help?


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Guys.. If the question asks, 'namakan pertubuhan yang dianggotai oleh negara kita.' Can we just answer NAM or we have to write in full which is Pergerakan Negara-Negara Berkecuali?

NAM can d
lol
its over d la