Mathematics
12 Online
OpenStudy (anonymous):
Find theArea of the segment? {HELP}
Join the QuestionCove community and study together with friends!
Sign Up
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..
Join the QuestionCove community and study together with friends!
Sign Up
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..
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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 = ???
Join the QuestionCove community and study together with friends!
Sign Up
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