- #1
livelaughlove
- 6
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Homework Statement
there's a picture of the question... from my textbook
http://photos-h.ak.fbcdn.net/hphotos..._1385551_n.jpg
thers a diagram image of the problem too to help understand
Homework Equations
well its a word problem,
i used cosine rule at beginining and then pythagoras...i don't know what to do next but i think you calculare the area and then derivative. but i don't know how (whats the equation for the area)
The Attempt at a Solution
well i used the cosine rule for triangle BCO
BC^2 = 10^2 + 10^2 - 2x10x10 cosθ
BC = √(200-200cosθ)
XY = BC
BY^2 = BX^2 + XY^2 =
400 = BX^2 + (200-200cosθ)
BX^2 = 200 + 200cosθ
BX = √(200+200cosθ)
now what do i do?
reply asap ! :P thankss !
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