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Triangle Calculator

Solve any triangle from three knowns.

Sides (SSS)

Angle A
36.87°
scalene, right
Angle B
53.13°
Angle C
90.00°
Area
6.0000
Heron's formula
Perimeter
12.0000
Inradius / Circumradius
1.0000 / 2.5000
Inscribed / circumscribed circle radii
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Triangle Calculator · Generated 5/2/2026 · calccenter.online/calculators/math/triangle

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About the Triangle Calculator

MethodologyHome

Solve any triangle from three knowns. Use this free triangle calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Triangle Calculator do?

Solve any triangle from three knowns.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.