Triangle Calculator | Solve Any Triangle with Visualization

Triangle Calculator

Solve any triangle with visual feedback. Enter three values (including at least one side) to calculate all properties.

Triangle Visualization

a b c A B C

△ Triangle Properties

⚙️ Calculation Settings

Degrees
Radians

Note: Enter exactly 3 values (with at least one side) to solve the triangle.

Triangle Solution

Side Lengths

Side a

5.00

Side b

7.00

Side c

8.00

Angles

Angle A

38.21°

Angle B

60.00°

Angle C

81.79°

Other Properties

Area

17.32

Perimeter

20.00

Type

Scalene

Solved Triangle

a = 5.00 b = 7.00 c = 8.00 A = 38.21° B = 60.00° C = 81.79°

About the Triangle Calculator

This triangle calculator solves for all sides and angles of any triangle when you provide three values (with at least one side). It uses the Law of Sines and Law of Cosines to calculate the missing properties.

How to Use

  1. Enter any three values (sides a, b, c and angles A, B, C)
  2. Make sure to include at least one side length
  3. Select whether your angles are in degrees or radians
  4. Click “Calculate Triangle” to solve
  5. See the visualization update with your triangle

Equilateral

All sides equal
All angles 60°

Isosceles

Two sides equal
Two angles equal

Scalene

No sides equal
No angles equal

Right-Angled

One 90° angle
a² + b² = c²