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Obtuse Triangle Calculator

Result

Calculated result Obtuse Based on the values entered.
↗ Math

Obtuse Triangle Calculator — free online calculator.

Formula

Rule: Sort sides as a ≤ b ≤ c after validating the triangle; it is obtuse when c² > a² + b², otherwise Not obtuse.
  • Obtuse Triangle Calculator calculates its result from Side a, Side b, Side c. It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly.
  • The main inputs are Side a, Side b, Side c. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Obtuse Triangle

Inputs
  • Side a: 3
  • Side b: 4
  • Side c: 6

Using Side a = 3, Side b = 4, Side c = 6, the calculated result is Obtuse.

Sample result: Calculating…

Frequently asked questions

What does the Obtuse Triangle calculate?

Obtuse Triangle Calculator — free online calculator.

Which values should I enter?

Enter Side a, Side b, Side c using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Rule: Sort sides as a ≤ b ≤ c after validating the triangle; it is obtuse when c² > a² + b², otherwise Not obtuse..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026