Interactive resource
Right-triangle properties
Geometry. See that a leg opposite 30° is half the hypotenuse. Free interactive GeoGebra resource — adjust parameters in the browser.
Overview
See that a leg opposite 30° is half the hypotenuse.
Explanation
Acute angles in a right triangle are complementary.
If one acute angle is 30°, the opposite leg is half the hypotenuse.
Otherwise use Pythagoras or acute trig ratios.
How to use
Set θ to 30° and compare the opposite leg to the hypotenuse (ratio 1/2).