Resources
Trigonometry
Trigonometry: 9 free interactive math resources. Angles, triangles, trig functions, and ratios — wave and triangle views.
Guide
About this topic
Trigonometry starts from sine-wave graphs and unit-circle intuition, then moves to identities and triangle solving.
What you learn
- Sine/cosine graphs and period
- Amplitude and phase effects
- Link back to right-triangle definitions
- Write identities in the editor
Subtopics
Key formulas
sin²θ + cos²θ = 1y = A sin(ωx + φ)
FAQ
Degrees or radians first?
Classes often start in degrees; tools can show both.
How does this meet geometry?
Triangle solving pairs with similarity/Pythagoras tools.
Can I change amplitude?
Yes — use the sine-wave tool to explore A and period.
Resources in this topic
9 free interactive resources in 5 groups
Right triangles & ratios
- Activity
Acute trig ratios
Change an acute angle in a right triangle and read sin, cos, tan.
Open - Activity
Solving a right triangle
From known sides/angles, find the rest dynamically.
Open - Activity
Right-triangle properties
See that a leg opposite 30° is half the hypotenuse.
Open - Activity
Pythagorean theorem
Drag a right triangle and watch the square areas satisfy a² + b² = c².
Guide - Activity
Similar triangles
Drag vertices and watch corresponding side ratios.
Guide