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Calculate the Opposite Side of an Angle

Calculate the length of the piece a, that is enclosed by two rays of the length b with the angle α.

α = acos( 1 - a²/(2b²) )

a = √ 2b²( 1 - cos(α) )

b = √ a² / ( 2(1 - cos(α)) )
    Opposite side angle

Decimal places:

Angle α: °
Length of the opposite side a:
Length of the rays b:

Please enter two values, the third will be calculated. The unit of the angle is degrees, here you can convert angle units.

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