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Triangle formulas
5 formulas for Triangle, from the Mensuration (2D & 3D) section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Area | A = ½ × b × h 🧮 Solve step by step | |
| Area (Heron's formula) | A = √(s(s − a)(s − b)(s − c)) 🧮 Solve step by step | |
| Perimeter | P = a + b + c 🧮 Solve step by step | |
| Equilateral triangle area | A = (√3 / 4) a² 🧮 Solve step by step | |
| Right triangle (Pythagoras) | c² = a² + b² 🧮 Solve step by step |
What the letters mean
| b | base |
| h | height (perpendicular to the base) |
| a, b, c | sides |
| s | semi-perimeter = (a + b + c) / 2 |
Angles add up to 180°.
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Related: Mensuration (2D & 3D)
SquareRectangleRight TriangleEquilateral TriangleParallelogramRhombusTrapezium (Trapezoid)KiteRegular PentagonRegular HexagonCircleSemicircleSector of a CircleRing (Annulus)Ellipse (Oval)CubeCuboid (Rectangular box)CylinderHollow Cylinder (Pipe)Right Circular ConeFrustum of a ConeSphereHemisphereHollow Sphere (Spherical Shell)Square PyramidTriangular PrismUnit conversions for area & volume