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what is the formula for determining the area?

what is the formula for determining the area of ​​triangles? They are different there. Equilateral, rectangular Yes, I know about (a * h) / 2, but for example for Equilateral trianglesw I need to use (a**2 * sqrt(3)) / 4! Could anybody help me

Created: Dec. 8, 2020, 7:56 p.m.
Updated: Dec. 9, 2020, 5:13 p.m.
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SuperSaid09