sin(30°)

⚠ Degrees → radians: multiply by $\frac{\pi }{180}$, so the expression becomes $\sin (\frac{30}{180}·\pi )$

Let's calculate: $\sin (\frac{30}{180}\times \pi )$

The fraction: $\frac{30}{180}$ simplifies by the common factor: $30$ into the new fraction: $\frac{1}{6}$

$\sin (\frac{1}{6}\times \pi )$

ⓘ The sine is the y-coordinate (vertical axis) of the point reached on the unit circle after a rotation of $\frac{1}{6}\times \pi$ radians from the horizontal axis pointing to the right, this is a remarkable value: $\sin (\frac{1}{6}\times \pi )$ = $\frac{1}{2}$

▶Result:   $\frac{1}{2}$

The numeric value of: $\frac{1}{2}$ equals:

▷ $0.5$