Incommensurability of the Base and Leg in an Isosceles Triangle
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In an isosceles triangle, if the measure of the leg angle is 72°, then the base and a leg are incommensurable. (Two lengths and are called incommensurable if their ratio is irrational.)
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Contributed by: Izidor Hafner (September 2012)
Open content licensed under CC BY-NC-SA
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