How to Use the Triangle Calculator

A Triangle Calculator is a tool that allows users to determine a triangle’s properties such as perimeter, area, and type (equilateral, isosceles, or scalene) based on the side lengths provided.

What Does It Do?

This calculator is designed to:

• Accept three side lengths of a triangle
• Calculate the perimeter (total distance around the triangle)
• Calculate the area using Heron’s formula
• Classify the triangle as:
  • Equilateral (all sides equal)
  • Isosceles (two sides equal)
  • Scalene (no sides equal)

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How to Use It

Step 1: Enter Side A

• Input a positive number representing the length of side A.

Step 2: Enter Side B

• Enter the second side of the triangle.

Step 3: Enter Side C

• Input the third side of the triangle.

Step 4: Click “Calculate”

• The calculator will:
  • Check if the sides form a valid triangle
  • Show the perimeter (sum of all sides)
  • Show the area (in square units)
  • Show the type of triangle

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Example

If you enter:

• Side A: 5
• Side B: 7
• Side C: 8

You will get:

• Perimeter: 20 units
• Area: ~17.32 sq. units
• Type: Scalene

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FAQ: Triangle Calculator

Q: Can I input just two sides and an angle?
A: This version only supports 3 sides. If you need a version using angles (e.g., SAS, ASA), let us know!

Q: What happens if I enter sides that can’t form a triangle?
A: You’ll get an alert — the calculator uses the triangle inequality rule to verify validity.

Q: Is the area calculated using Heron’s Formula?
A: Yes! It uses Heron's formula for all triangle types.

Q: What units should I use?
A: Any consistent unit works (cm, meters, inches). Just use the same unit for all sides.

Q: Can I use decimals?
A: Yes! You can enter whole numbers or decimals (e.g., 5.75, 3.2).