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The golden ratio is the most irrational number.

The equal sides of an isosceles triangle are each 18 cm and the equal angle are 72°, find the length of the height of the isosceles triangle…Does anyone know the answer? If

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Golden Angle Triangle and the Fibonnaci Spiral

What ratio represents the tangent of angle M of Triangle MNO, if the measure of angle O=90°, MO=36, NM=85 and ON=77? - Quora

Golden angle - Wikipedia