Need help quick plz. thank you.?

👨🏻‍🏫 學術台數學

iv23361512

2008-11-28 11:53 pm

Someone plz help me for this question... than you :)
http://img246.imageshack.us/img246/6249/20161520lp3.png

更新1:

Sorry i think the picture is not clear what i am asking .. this is the correct one http://img408.imageshack.us/img408/6375/76963909yd4.png Do not use the above picture

更新2:

thank you amt pnt, do u have another way to solve it without using the sin, cos , tan formula?

回答 (2)

[匿名]

2008-11-29 12:02 am

✔ 最佳答案

create a perpendicular line from the centre to the bottom,
use Pythagoras: X(^2)=18^(2) - 12^(2)

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[匿名]

2008-11-29 8:11 am

lets draw a perpendicular from centre to the base and name it "r". the a traingle is formed with sides 18, 12 and r. then use following formula.

r^2 = 18^2 + 12^2 - 2(18*12*cos 55)

using calculator,

r = 14.84 (rounding off at 2 decimal place)

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