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Mathematics 12 Online
OpenStudy (anonymous):

Find theArea of the segment? {HELP}

OpenStudy (anonymous):

OpenStudy (anonymous):

I did some multiplying and then i tried adding but i havent gotten any answer thats close to my options. Ignore my scribbles..

OpenStudy (anonymous):

Help?

jimthompson5910 (jim_thompson5910):

what is the area of the circle?

OpenStudy (anonymous):

im trying to figure that out. lol but the circle is 360 degrees..

jimthompson5910 (jim_thompson5910):

use the formula A = pi*r^2 to find the area of the whole circle

OpenStudy (anonymous):

3.14r^2

jimthompson5910 (jim_thompson5910):

in this case r = 24, so A = 3.14*24^2

OpenStudy (anonymous):

1808.64

OpenStudy (anonymous):

i keep getting that number but its wrong..

jimthompson5910 (jim_thompson5910):

now the sector (ie the pie shaped piece) that is formed from the 120 degree angle is exactly 120/360 = 1/3 of the whole circle area

jimthompson5910 (jim_thompson5910):

so 1/3 of (area of circle) = (1/3)*1808.64 = 602.88

jimthompson5910 (jim_thompson5910):

what is the area of the triangle?

OpenStudy (anonymous):

idk

jimthompson5910 (jim_thompson5910):

now you use this formula A = (1/2)*b*c*sin(theta) b and c are the two sides theta is the angle between the two sides b and c

OpenStudy (anonymous):

i got the 602.88 part, but now im lost.

OpenStudy (anonymous):

i dont know what theta means

jimthompson5910 (jim_thompson5910):

theta is the angle, in this case it's 120

OpenStudy (anonymous):

ok.

jimthompson5910 (jim_thompson5910):

so you need to evaluate A = (1/2)*b*c*sin(theta) A = (1/2)*24*24*sin(120) A = ???

OpenStudy (anonymous):

a=249.4153

jimthompson5910 (jim_thompson5910):

now subtract that from the area of the sector

OpenStudy (anonymous):

249.4153- x = ??

OpenStudy (anonymous):

what was the sector?

jimthompson5910 (jim_thompson5910):

the sector is this region here |dw:1372712565371:dw| ie it's the pie-shaped region

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