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Prove that the area of an equilateral triangle described on one side of a square is equal to half the area of the equilateral triangle described on one of its diagonals

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Let ABCD be a square of side a. Therefore, its diagonal Two desired equilateral triangles are formed as ΔABE and ΔDBF. Side of an equilateral triangle, ΔABE, described on one of its sides = a Side of an equilateral triangle, ΔDBF, described on one of its diagonals We know that...
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Let ABCD be a square of side a.

Therefore, its diagonal 

Two desired equilateral triangles are formed as ΔABE and ΔDBF.

Side of an equilateral triangle, ΔABE, described on one of its sides = a

Side of an equilateral triangle, ΔDBF, described on one of its diagonals 

We know that equilateral triangles have all its angles as 60º and all its sides of the same length. Therefore, all equilateral triangles are similar to each other. Hence, the ratio between the areas of these triangles will be equal to the square of the ratio between the sides of these triangles.

 

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