From the periodicity of the sine function: sin(180+x) = -sin(x)
So sin(210º) = -sin(30º)
From the 1/2/√3 (30º/60º/90º) triangle, sin(30º) = 1/2
So sin (210º) = -1/2
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From the periodicity of the sine function: sin(180+x) = -sin(x)
So sin(210º) = -sin(30º)
From the 1/2/√3 (30º/60º/90º) triangle, sin(30º) = 1/2
So sin (210º) = -1/2