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You are correct. That is an error. The formula for area of those triangles should be 1/2 * r^2 sin(theta). Fortunately, the end result is the same because minimizing twice a quantity is the same as minimizing the quantity itself.
Don't you have to divide by 2 to get the area of the triange?
You are correct. That is an error. The formula for area of those triangles should be 1/2 * r^2 sin(theta). Fortunately, the end result is the same because minimizing twice a quantity is the same as minimizing the quantity itself.
Don't you have to divide by 2 to get the area of the triange?