Co-relating moments of inertia with geometry.

An equilateral triangular plate has side length aa, and the moment of inertia about the axis shown is II.

A regular hexagonal plate has side length 2a2a, and the moment of inertia about the axis shown can be given as a constant multiple of II: kIk I.

What is k?k?

Note: Assume both plates have negligible thickness.

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