The area of an equilateral triangle is decreasing at a rate of 5 cm^2/s. find the rate at which the length of a side is changing when the area is 250 cm^2.

Question

sriram · Answer

calculus man just try on ur own i shall help u

anonymous · Answer

Aw MAAAAN it's harddd!

anonymous · Answer

What formula should I use?

anonymous · Answer

Cuz I tried out a=1/2bh and it doesn't seem to be working

sriram · Answer

look if u can get the area as a function of the side length
all u will have to do is diff it
so first get the area as a fn of side length

sriram · Answer

hint
look area of a triangle is 
1/2 *base *height

sriram · Answer

assume 1 side to be of length l
then what wud be d height

anonymous · Answer

If I take the derivative of that I end up with just 1/2

sriram · Answer

assume 1 side to be of length L
then what wud be d height

sriram · Answer

look in equilateral tri
all sides are equal
so use trigo and calculate the height

sriram · Answer

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anonymous · Answer

How am I supposed to use trig if none of the sides are given? :s

sriram · Answer

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