Solved: Disappearing triangle An equilateral triangle
Chapter 3, Problem 42(choose chapter or problem)
Disappearing triangle An equilateral triangle initially has sides of length 20 ft when each vertex moves toward the midpoint of the opposite side at a rate of 1.5 ft>min. Assuming the triangle remains equilateral, what is the rate of change of the area of the triangle at the instant the triangle disappears?
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