



 
Ahlee, I can get you started. From the diagram h = s × cos(θ/2) and AD = b/2 = s × sin(θ/2). Thus the area of the triangle is
But the double angle formula for sin(t) is
and hence the area of the triangle is
Now apply the calculus you know to find the relationship between dA/dt and dθ/dt. Penny  


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