Math practice · reimagined
Trigonometry
Turn Trigonometry into a fight you actually want to win. Every problem is an attack — solve it faster than your opponent and you land the hit.
Ages 7–70 · no download · plays in your browser · 20 languages
How it works
Trigonometry
Pick a fighter, choose Trigonometry, and trust your numbers. The faster and cleaner you solve, the harder you hit — from gentle early grades all the way to Olympic-level challenges.
Trigonometry connects the ANGLES of a right triangle to the lengths of its sides. The three famous ratios are remembered as SOH-CAH-TOA.
SOH: sin = Opposite ÷ Hypotenuse. CAH: cos = Adjacent ÷ Hypotenuse. TOA: tan = Opposite ÷ Adjacent. (The hypotenuse is the longest side, opposite the right angle; opposite/adjacent are which leg sits across from or next to your angle.) For the 3-4-5 triangle with the angle opposite the 3-side: sin = 3 ÷ 5 = 0.6.
Pick the right ratio, divide the two sides, and type the decimal.
More math to master
— Quick answers —
Trigonometry: the short FAQ
- Is the Trigonometry free to play?
- Yes. The Trigonometry is free to start right in your browser — no download, no signup. Paid plans later unlock the full fighter roster and the deeper curriculum.
- Who is the Trigonometry for?
- Anyone from 7 to 70. The early grades stay gentle for beginners, while the higher tiers will make even the confident sweat.
- Do I need to download anything to play the Trigonometry?
- Nope. The Trigonometry runs in any browser, and there's a mobile app on the same account if you'd rather train on your phone.
- Can the Trigonometry be used in the classroom?
- Absolutely. Teachers run the Trigonometry with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.