Trigonometry Pro

Bo Kalvslund

About this app

Trigonometry Pro is a clean, ad-free trigonometry toolkit for students, engineers, and anyone who works with triangles and angles every day.

Right Triangle Calculator
Enter any two known values — sides or angles — and the app instantly solves for all remaining sides, angles, and the hypotenuse. Supports all 9 input combinations (SSS, SAS, AAS, and more) with a live diagram that updates as you type.

General Triangle Calculator
Handles any triangle — no right angle required. Enter the values you know (sides, angles, or a mix) and get a complete solution across all 5 modes. The ambiguous SSA case is detected automatically and both valid triangles are shown side by side.

Interactive Theory Section
- Right Triangle Reference — a concise overview of sin, cos, tan, inverse functions, and the Pythagorean theorem.
- Pythagorean Theorem — a step-by-step animated proof built around the classic 3-4-5 triangle.
- Unit Circle Explorer — tap any key angle (0°, 30°, 45°, 60°, 90° …) to highlight it on the canvas and see the exact sin, cos, and tan values.

Calculation History
Results are saved automatically after one second of inactivity. Browse, review, or clear your history at any time from the History screen or Settings.

Settings
- Angle unit: Degrees or Radians
- Display precision: choose the number of decimal places that fits your workflow

Designed for real use
- Material 3 design with full dark-mode support
- Haptic feedback on solved results
- Smart keyboard navigation (Next / Done) with automatic scroll to keep input fields visible

No ads. No subscriptions. No account required.

What’s new

• Right Triangle Calculator — solve any combination of sides and angles instantly
• General Triangle Calculator — all 5 modes, including the ambiguous SSA case
• Interactive Unit Circle — tap key angles to see exact sin, cos and tan values
• Animated Pythagorean Theorem proof
• Auto-saved calculation history
• Degrees or radians — your choice