Trig ratios of an acute angle – measuring height with elevation angle

MathematicsTrigonometryAges 14–15

Right triangle ABC, right-angled at A: drag vertex C to change the acute angle B = α, drag B to change the adjacent side; sin, cos, tan and cot of α update instantly from the side ratios. In application mode, an observer stands a set distance from a building; drag the angle of elevation to find the building's height using tan α.