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0.8660 is a shortened form of ' Sqrt(3) / 2 '.

It refers to

Sin(60 degrees) = opposite(sqrt(3) / Hypotenuse(2).

Similarly the Complementary Sine ( Cosine/Cos) /

Cos(30 degrees) = sqrt(3) / 2

A more accurate valuer for sqrt(3)/2 is 0.8669254038.... ) NB It is NOT the exact value, because sqrt(3 is an irrational number.

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lenpollock

Lvl 17
2w ago

What else can I help you with?