Triangle Calculator

Step 2: Click "Calculate Triangle Properties"

After entering the side lengths, click the "Calculate Triangle Properties" button to process your input.

Step 3: Interpret the Results

The calculator will display various properties of your triangle:

• Perimeter: Sum of all sides
• Area: Space inside the triangle
• Angles: Interior angles A, B, and C
• Triangle Classification: Type of triangle based on sides and angles

Math Examples

Example 1: Right Triangle (3-4-5)

Input: Side A = 3, Side B = 4, Side C = 5

Results:

• Perimeter: 3 + 4 + 5 = 12
• Area: √(s(s-a)(s-b)(s-c)) = √(6(6-3)(6-4)(6-5)) = 6
• Angles: A ≈ 36.87°, B ≈ 53.13°, C = 90°
• Classification: Scalene and Right

Example 2: Equilateral Triangle

Input: Side A = 5, Side B = 5, Side C = 5

Results:

• Perimeter: 5 + 5 + 5 = 15
• Area: (√3/4) * 5² ≈ 10.83
• Angles: A = B = C = 60°
• Classification: Equilateral and Acute

Example 3: Isosceles Triangle

Input: Side A = 5, Side B = 5, Side C = 8

Results:

• Perimeter: 5 + 5 + 8 = 18
• Area: √(s(s-a)(s-b)(s-c)) ≈ 12.5
• Angles: A ≈ B ≈ 44.42°, C ≈ 91.17°
• Classification: Isosceles and Obtuse

Tips for Using the Calculator

• Ensure your side lengths can form a valid triangle (sum of any two sides must be greater than the third side).
• Use consistent units for all side lengths.
• For precise calculations, enter decimal values if necessary (e.g., 3.5 instead of 3 1/2).
• Experiment with different side lengths to explore various triangle types and properties.