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 4–99+ · no download · plays in your browser · 23 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.
Every level of Trigonometry
- T1Triangle ratiosGrade 10 · 15 yrssin / cos / tan as a decimal.Play free ▸
- T2Inverse → angleGrade 11 · 16 yrsWhich angle has this ratio? (in degrees)Play free ▸
- T3Radians → degreesGrade 11 · 16 yrsConvert a radian angle to degrees.Play free ▸
- T4IdentityGrade 11 · 16 yrssin²θ + cos²θ = 1 — find the missing ratio.Play free ▸
- T5Solve a sideGrade 10 · 15 yrsRatio × hypotenuse gives the side.Play free ▸
More math to master
— Quick answers —
Trigonometry: the short FAQ
- Is Trigonometry free to play?
- Yes. Trigonometry is free to play right in your browser — the whole curriculum, no download, no signup. Paid plans later unlock the full fighter roster, every stage and saved progress.
- Who is Trigonometry for?
- Anyone from 4 to 99+. 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 Trigonometry?
- Nope. Trigonometry runs in any browser, on a laptop, tablet or phone.
- Can Trigonometry be used in the classroom?
- Absolutely. Teachers run Trigonometry with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.