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for example the are 1 and x for the first one we get $\cfrac{\sqrt3}{4}$for the first area and for the height of the other triangle we have $\dfrac{2}{\sqrt3}$ for the base and 1 for the height so the ratio is $\dfrac{\sqrt3}{4}$ $:$ $\dfrac{2}{\sqrt3}$

A side of one equilateral triangle is congruent to an altitude of another equilateral triangle.  What is the ratio of their areas?

1st Δ        side = 1        height = 0.866025403         area = 0.433012701 u²

2nd  Δ        height = 1          side = 1.154700538       area = 0.577350269 u²

The ratio of their areas is  3/4