[color=#000000]Suppose a circle has radius of 25 feet.  [/color][br][color=#000000]Suppose an [/color][b][color=#ff0000]isosceles triangle[/color][/b][color=#000000] is drawn around this triangle so that each of its 3 sides is tangent to this circle.  (Such a triangle is said to be circumscribed about the circle.)  [/color][br][br][b][color=#0000ff]If this is the case, use calculus to determine the dimensions (height and base) of such a triangle that minimizes the triangle's area.  Also, prove that these actual dimensions minimize the area of this triangle.  [/color][/b]