An Incredible Ratio

Geometry Level 3

Given a triangle A B C \triangle {ABC} , an ellipse is drawn through the points A , B , C A, B, C such that it's center is at the centeroid of the triangle. Another ellipse is drawn through the mid points of A B , B C , C A \overline {AB},\overline {BC},\overline {CA} touching these line segments.

What is the ratio of the area of the later ellipse to that of the former?


The answer is 0.25.

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1 solution

Aaghaz Mahajan
Jul 2, 2020

The ellipses are known as Steiner Circumellipse and Steiner Inellipse . Using the well known properties linking their areas with the triangle's we arrive at the answer 1 4 \displaystyle \frac{1}{4}

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