Trigonometry: Ratios & Rules

Trig ratios and exact values, the sine and cosine rules, and the area of a triangle.

Ratios and exact values

SOHCAHTOA in right-angled triangles. Learn exact values for 0°, 30°, 45°, 60°, 90°.

$\theta$	30°	45°
$\sin$	$\frac12$	$\frac{\sqrt2}{2}$
$\cos$	$\frac{\sqrt3}{2}$	$\frac{\sqrt2}{2}$
$\tan$	$\frac{1}{\sqrt3}$	1

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