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A rhombus has 4 congruent sides, its diagonals bisect each other and are perpendicular between them.

If we know the length of the side, a, and the length of one of the diagonals, d1, we can find the area, A, of the rhombus which is:

A = (d1)[(1/2)(d2)]

How to find the one half of d2?

(1/2)(d2) = √[a^2 - [(1/2)(d1)]^2] = √[a^2 - (1/4)(d1)^2]

So,

A = (d1)[(1/2)(d2)]

A = (d1)√[a^2 - (1/4)(d1)^2]

A = √[(d1^2)[a^2 - (1/4)(d1)^2]]

A = √[(d1^2)(a^2) - (d1^4)/4]

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Q: What is the area of a rhombus when one side and a diagnol is given?
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Area of rhombus if area and perimeter is given and if you have to find altitude?

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