who's good at math? i need help

hirichard · Nov 10, 2008

im in this class thats called credit recovery and im behind. i have 31 credits right now and i need 44 by the end of june, and if i pass all my classes this year i'd have 43
someone want to help me out please
i need to pass all my classes this year or i will not graduate high school
i get geometry except one lesson,circles.
:boo:

if you know how, just help me set up this formula please
thanks

gzero87 · Nov 10, 2008

I think you just get the shaded area given and divide that by overall area then you have a percent of what the shaded reason takes up.

Then figure out the circumfrence of the whole circle and multiply the percent.

so

Shaded Area/Circle Area= Percent---> Percent * Circle Circumference= Shaded Circumference

(45.27/Pi(6)^2)=.400275
.400275*(Pi(2*6))=15.09
Not sure if thats the right way to do it, I haven't taken geometry in a wicked long time.

I got 15.09 CM if thats not right im so sorry haha

sonnyleq · Nov 10, 2008

Your high school gives u online hw??
Wtf.... my highschool was hella broke then

hirichard · Nov 10, 2008

gzero87 said:
I got 15.09 CM if thats not right im so sorry haha

you found the area of the shaded region i think
i was supposed to find the length of the arc thanks anyway

sonnyleq said:
Your high school gives u online hw??
Wtf.... my highschool was hella broke then

it's new this year, its a good help for people who are behind in their work and all that.

MikeyMike · Nov 10, 2008

the answer is Cherry whomp whomp whomp EAT THEM GHOSTS

truonghthe · Nov 10, 2008

I got simliar to the person post before.

A= 3.14 x r^2

because.

3.14 x 6^2 = 113.04 cm^2 (remember this area of a whole circle)

Shaded area given 45.27 cm^2

so: 45.27 is how much percent of 113.04 (since 113.04 is 100% correct?)

I did: 45.27 / 113.04 = 0.4001 (Rounded to 40% is the shaded part of whole circle area)

Circumference formula:

C= 2 x 3.14 x r

Therefore 2 x 3.14 x 6 = 37.68 (run around 360 degree of a circle)

Since the shaded area are 40% of that circle's arch.

so I got: 37.68 x .4 = 15.072 cm

I hope it did explain for you all the number I came up with. GL with that lol, I hate Geometry alot lol.

gzero87 · Nov 11, 2008

you found the area of the shaded region i think
i was supposed to find the length of the arc thanks anyway

Oh I think i didnt explain it well enough, haha. The 15.09 cm is what i got for that arc. Im not very good explaining things haha

But trounghthe explained it very well, just follow what he did.

hirichard · Nov 11, 2008

i bet all the asians are gonna answer to this
(im asian btw so dont think im racist :wtf1:

)

gzero87 · Nov 11, 2008

sk858 said:
i bet all the asians are gonna answer to this
(im asian btw so dont think im racist)

haha your probably right! i mean i answered it too!

WillT. · Nov 12, 2008

Check this website out:
http://www.analyzemath.com/Geometry_calculators/arc_length_area_sector.html

In the second equation, plug in the area for "A" and the radius for "r" and then solve for "t". After you find "t", which is the angle, then you can plug it into the first equation which will give you the arc length.

who's good at math? i need help

hirichard

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gzero87

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sonnyleq

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hirichard

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MikeyMike

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truonghthe

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gzero87

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hirichard

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gzero87

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WillT.

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