Classifying Triangles Calculator

Classify a triangle by its sides and angles.

By sides Scalene

By angles Right

Formula: Compare sides; compare longest² with sum of other squares

Step-by-step with your numbers:

1. Values used:

2. Side a = 3

3. Side b = 4

4. Side c = 5

6. By sides = Scalene

7. By angles = Right

Did we solve your problem today?

Classify any triangle two ways: by its side lengths and by its largest angle.

The math behind it

By sides: all equal = equilateral, two equal = isosceles, none equal = scalene. By angles: compare the longest side squared with the sum of the other two squared (Pythagorean comparison).

Worked example

Sides 3, 4, 5: scalene and right (since 25 = 9 + 16).

FAQ

Can a triangle be both?

Yes — e.g. a triangle can be isosceles and right at the same time.

The math behind it

Worked example

FAQ

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