ABCD is a rhombus, ABD is an equilateral triangle, and AC is equal to 4. Find the area of the rhombus.

Correct answer:

S =  4.6188

Step-by-step explanation:

u1=4 tan60°/2=u2/u1 u2=u1tan30°=2.309  S=2u1u2=242.309=4.6188

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Calculation of an equilateral triangle.
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