How to Use This Calculator

This calculator can solve a right-angled triangle (with one angle at 90°) for all remaining unknown values (sides, angles, area, and perimeter).

• You must enter exactly two known values.
• The two values can be any combination (e.g., two sides, or one side and one angle).
• Side ‘a’ and ‘b’ must be smaller than Side ‘c’ (the hypotenuse).
• Angle ‘A’ (opposite side ‘a’) and Angle ‘B’ (opposite side ‘b’) must be less than 90°.
• Click the “Calculate” button to see all the results.
• Click “Reset” to clear all fields for a new calculation.