Sine, cosine, tangent — unlock the maths of triangles and waves!
Sine, cosine and tangent in right-angled triangles.
Calculate sin, cos and tan for any angle.
Use trig ratios to calculate unknown sides in right triangles.
Coming SoonUse inverse trig (arcsin, arccos, arctan) to find angles.
Coming SoonAngles and trig values on the unit circle.
Coming SoonPlot and understand trig curves and their properties.
Coming SoonPythagorean, double angle and compound angle identities.
a/sinA = b/sinB — solve any triangle, not just right-angled.
Coming Soonc² = a² + b² − 2ab cosC — another tool for any triangle.
Coming SoonFind all angles in a range that satisfy a trig equation.
Coming SoonConvert between degrees and radians — the natural unit of angle.
Coming SoonApply trig to three-dimensional problems.
Coming Soonarcsin, arccos, arctan — domains, ranges and graphs.
Amplitude, period and phase shift — transforming trig graphs.
Coming Soone^(iθ) = cos θ + i sin θ — the most beautiful equation in maths.
Coming SoonRepresent any periodic function as a sum of trig functions.
Coming Soonsinh, cosh, tanh — the trig analogues for hyperbolas.
Coming SoonHow trig functions extend beautifully into complex numbers.
Coming SoonPractice Trigonometry with all 4 game types.
🎮 Go to Games →