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Math help +K

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pianoman
Posts: 2503 - Karma: 779
this is probably really simple but i can't figure it out....i'm in 10th grade.

A sector of a circle has perimeter 12 cm and area 8 sq cm. Find all possible radii. I figured out that 2cm works but i just guessed. and it says all possible radii. i love you no homo. i'll check this thread tomorrow morning. thanks NS!
Apr 21 2009 5:44PM
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Totes_Magotes
Posts: 2259 - Karma: 870
it can only be 2.. i'm pretty sure, A=2piR
Apr 21 2009 5:59PM
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thefilmerguy
Posts: 2847 - Karma: 55
its a circle. it only has one radius per given circumference or area.
Apr 21 2009 6:01PM
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Slinger1x1
Posts: 8853 - Karma: 66
yeah what do you mean find all the possible radii? there is one radius...
Apr 21 2009 6:06PM
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no_steeze
Posts: 23992 - Karma: 4,272
yeah, how can a circle have multiple radii when the circumference and the area are set numbers?
Apr 21 2009 6:09PM
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Dr.Scholl
Posts: 1139 - Karma: 47

if you set the formulas to equal the same thing, such as pi, you can set those equal to eachother and solve for r using factoring or the quadratic formula

Apr 21 2009 6:10PM
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TeamJones
Posts: 629 - Karma: 12
Remember, the SECTOR has perimeter 12. So 2R+ R(theta)=12 and 1/2 (r^2) (theta) = 8. Two equations, two variables, if I feel like spending the time figuring it out I'll post later.
Apr 21 2009 6:15PM
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TeamJones
Posts: 629 - Karma: 12
R=2 and R=4
Apr 21 2009 6:34PM
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jayo.
Posts: 5015 - Karma: 34
i think its asking for all of the possible numbers that that radius could be
Apr 21 2009 6:36PM
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no_steeze
Posts: 23992 - Karma: 4,272
ooohhhh, sector
okay well then i don't feel like spending the time to figure that out, i'm busy enough doing gay ass logarithms
Apr 21 2009 6:38PM
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Leo.
Posts: 508 - Karma: 17

but i think 8 is the sectors area, which is an isosceles triangle i think

Apr 21 2009 6:50PM
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EAST~COAST
Posts: 1017 - Karma: 91
lol wow i love how every math nerd is like "o ik this let me waste my time and help this kid"
your a smart man for whoever posted this, your probably like "ill make losers do it and ill go screw my bitch" lmfao
Apr 21 2009 6:54PM
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no_steeze
Posts: 23992 - Karma: 4,272
excellent deduction watson!!
Apr 21 2009 7:03PM
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Jordan
Posts: 4079 - Karma: 2,122
What is "you're" for 500 Trebek.
Apr 21 2009 7:05PM
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TeamJones
Posts: 629 - Karma: 12
Yes, because plugging two quick equations into my calculator and finding the intersections, which takes about 5 seconds, is wasting my time. I know, instead of helping other people, lets just make fun of everyone who does! The people in New Orleans didn't need any help after Katrina, they just wanted to screw their bitches.
Apr 21 2009 7:12PM
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ReetsAdeets
Posts: 1531 - Karma: 611
could it be 2 and -2?  cause 2 squared is 4, and -2 squared is 4 also.  proly not, just an idea though.
Apr 21 2009 7:27PM
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uni-corn
Posts: 13846 - Karma: 651
Can't have a negative radius.
Apr 21 2009 7:40PM
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pianoman
Posts: 2503 - Karma: 779
quite correct sir, somebody at school showed me the way to show my work for that (longish process) and i'd like to thank those who made a valiant effort on this thread. i couldn't up anyone's karma because y'all had already been at 10. sorry
Apr 24 2009 4:49PM
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