hero formulae

Hero's formula

[heer-ohz]
noun Geometry.
the formula for the area of a triangle when the sides are given: for a triangle with sides a, b, and c, the area is equal to , where s is equal to one half the perimeter of the triangle.

Origin:
named after Hero of Alexandria

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Hero formulae is always a great word to know.
So is zedonk. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
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