- #1
Greywolfe1982
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Homework Statement
Two sides of a triangle of fixed length measure 12m and 15m. The angle between these two sides increases at a rate of 2 degrees per minute. When the angle between these two sides is 60 degrees, at what rate is the third side increasing?
Homework Equations
That's the problem.
The Attempt at a Solution
I'm not sure what equation I should differentiate - law of sines would give be division by zero (something over (da/dt)^2), and law of cosines would give me 0 = 0, as the length of the sides are not changing. What equation am I forgetting here, or am I going at this from completely the wrong way?