Trigonometric

Learn trigonometry by seeing it move. Trigonometric turns every formula into something you can drag, spin and explore — free, with no ads, no accounts and no internet needed.

UNIT CIRCLE
• Drag point A round the circle or use the slider and play button
• Change the radius OA and read x = OA·cos θ, y = OA·sin θ, arc length AB, circumference and sector area
• Exact values such as √3/2, angles in degrees and as multiples of π, quadrant signs (All–Sin–Tan–Cos) and the tangent line

3D SPHERE — SPHERICAL COORDINATES
• Place a point P(r, θ, φ) on a glass sphere you turn with your finger
• See it converted to x, y, z and back, with top and side views
• Explore the volume element r² sin θ dr dθ dφ

GRAPHS
• A rotating circle draws sin, cos and tan, projected straight onto the curve
• Reshape y = A·f(Bx + C) + D with sliders and read amplitude, period, phase shift and midline
• Type your own formula — or try examples like a Fourier square wave, a damped wave or beats

TRIANGLE SOLVER
• Solve any triangle from three values: SSS, SAS, ASA/AAS and the ambiguous SSA case
• Drawn to scale, with area, perimeter and every step of the working

FORMULAS & QUIZ
• A searchable cheat sheet of identities, the laws of sines and cosines and the special-angle table
• Quick ten-question quizzes with an explanation after every answer

Three colour themes, full iPad support and a side-by-side landscape layout. Made for students, teachers and anyone curious about trigonometry.