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sot
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| LF People who love Maths! |
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Hey u guys
Y, vacation is done, and i still need to make my homeworks, pretty sucks, but y.
I opened my math book cus i had to make an exercise. Only theres one Huge problem, i don't get it. I was thinking and thinking but nothing. I was wondering, if maybe some of u guys could help me, tell me how u start on it, and how u get it.
This is how the exercise looks like:
Stipulate the number of sides of a convex polygon of which the sum of the angles is equal to 28 straight angles.
y...tell me what, i don't get it either :P
i hope any of u guys could help, i would be pleased :-)
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| 02/10/08 02:59 |
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dalgur
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| RE: LF People who love Maths! |
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| QUOTE |
Stipulate the number of sides of a convex polygon of which the sum of the angles is equal to 28 straight angles.
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sum of the angles= 28*90°=2520°
the sum of the angles of a polygon with n-sides=(n-2)*180°
so: 2520°=(n-2)*180°
Now you just need to work this out, i think it's better if you do that yourself. I don't wanna do all your homework for you.
I hope this helped.
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| 02/10/08 03:54 |
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Jdun
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| RE: LF People who love Maths! |
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After I read the topic above, I decided to remove the answer lol...
GA helping people with math...lol >_>
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| 02/10/08 04:11 |
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sot
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| RE: LF People who love Maths! |
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thx alot u guys
but to be honest, i don't get it, are u sure thats the formule to get know the sides of the thingy?
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| 02/10/08 04:56 |
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dalgur
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| RE: LF People who love Maths! |
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Yes, they're both correct.
If you wanna use Jdun's formula remember that the sum of the angles in the middle is always 360°
Just try to work it out. It's just an equation from now on.
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| 02/10/08 05:19 |
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sot
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| RE: LF People who love Maths! |
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hmm
im not sure if htis is right
12 Sides?
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| 02/10/08 07:56 |
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sot
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| RE: LF People who love Maths! |
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so i used the first formule, and i had:
28x90°= 2520°
2520°=(n-2) x180°
2520°='14-2) x180°
2520=12X180°
aaagh!!i don't get it :(
edit
how do i knowx how many trangles fit in the polygon?
is it: 2520:180?
is 12 the correct answer?
***THIS POST HAS BEEN EDITED***
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| 02/10/08 08:03 |
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dalgur
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| RE: LF People who love Maths! |
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You're going to fast.
you have to move all numbers to one side and leave n on the other one.
You begin with
2520°=(n-2)x180°
now move 180° from the rigth side to the left one. To do that you have to divide bothe sides with 180°
2520°=(n-2) x (180°/180°)
180°
(You can leave out the (180°/180°), it's just 1)
After this you move the 2. So this makes
(2520°)+2=n-2+2
180°
The conclusion is
(2520°)+2=n
180°
I hope you understand it now. Sorry that I didn't calculate it all for you but I think you will understand it better if you do that yourself.
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| 02/10/08 08:23 |
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Saint89
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| RE: LF People who love Maths! |
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| QUOTE | so i used the first formule, and i had:
28x90°= 2520°
2520°=(n-2) x180°
2520°='14-2) x180°
2520=12X180°
aaagh!!i don't get it :(
edit
how do i knowx how many trangles fit in the polygon?
is it: 2520:180?
is 12 the correct answer? |
Lol what are you doing in that equation? It should be like (n-2)*180=180n-360 etc. You for some reason thought n=14?
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| 02/10/08 08:25 |
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sot
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| RE: LF People who love Maths! |
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hm, so N= 12?
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| 02/10/08 08:52 |
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dalgur
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| RE: LF People who love Maths! |
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No, you made a small mistake
2520+2=N
180
14+2=N
16=N
You subtracted 2 instead of adding it.
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| 02/10/08 09:17 |
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sot
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| RE: LF People who love Maths! |
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ow, y now i c it, thx alot for ur hel^p ;D
So i written down on my paper:
25X 90°=2520°
2520°= (n-2) x 180°
2520°= N-2
_____
180
2520°+2= n
_____
180
N=16
The polygron has 16 sides
right? :)
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| 02/10/08 09:32 |
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DarkNshY
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| RE: LF People who love Maths! |
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Math's not lame...
Edited by Wyat <3
***THIS POST HAS BEEN EDITED***
duleet @ xfire
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| 02/10/08 09:35 |
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sot
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| RE: LF People who love Maths! |
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i know it's boring, i don't like it either
but is that the correct stuff i replied? (what i had to write down)
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| 02/10/08 09:45 |
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dalgur
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| RE: LF People who love Maths! |
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Isn't it 28X 90°=2520°?
Other than that everything is correct.
I hope you understand everything. Next time don't wait till the last day to make your homework.
Have fun tomorow. =p
***THIS POST HAS BEEN EDITED***
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| 02/10/08 10:18 |
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Riotpoll
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| RE: LF People who love Maths! |
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It also makes the world go round ;)
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| 02/10/08 10:25 |
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sot
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| RE: LF People who love Maths! |
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y ur right, its 28, typing fault ;D
Thx alot to everybody who helped me
rly many thx :D
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| 02/10/08 10:26 |
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Wyat_hawke
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| RE: LF People who love Maths! |
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Good job to everyone I'd say ;-)
(and +cred to some for helping out)
***THIS POST HAS BEEN EDITED***
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| 02/10/08 11:52 |
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Rap Man
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| RE: LF People who love Maths! |
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Rawr I love maths <3 We don't do anything like this though lol, pure stuff all the way :P
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| 02/10/08 12:00 |
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stranger of kryta
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| RE: LF People who love Maths! |
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lol at 'people who love maths' maths + me = epic fail and thats all the maths i need to ever know :)
Hai, my name is sam
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| 02/10/08 12:46 |
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