Relating six properties of a triangle in one equation
by John from John D. Cook on (#6RGBY)
Let a, b, and c be the sides of a triangle.
Let p be perimeter of the triangle.
Let r be the radius of the largest circle that can be inscribed in the triangle, and let R be the radius of the circle through the vertices of the triangle.
Then all six numbers can be related in one equation:
2prR = abc.
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