Trigonometric Ratios

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The value of sin 30° is

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1. **Standard Observation**: In a $30^{\circ}-60^{\circ}-90^{\circ}$ triangle, the side opposite to the $30^{\circ}$ angle is exactly half of the hypotenuse.
2. **Ratio Definition**: $\sin 	heta = \frac{	ext{Opposite}}{	ext{Hypotenuse}}$.
3. **Substitute**: For $	heta = 30^{\circ}$, $\sin 30^{\circ} = \frac{1}{2}$.
4. **Radial Conversion**: $30^{\circ} = \pi/6$ radians.

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