Math Formula Encyclopedia
Search, understand, and use formulas across arithmetic, algebra, geometry, trigonometry, calculus, statistics, finance, science, engineering, and everyday math.
134 formulas10 subjectsExamples + variables
AllAlgebra 16Arithmetic 8Calculus 15Everyday Math & Conversions 7Finance & Business 9Geometry 28Number Theory & Sequences 8Science & Engineering 16Statistics & Probability 16Trigonometry 11
8 matching formulas
Geometry
Triangle Area
A = ½bh
Area of a triangle.
Open formula →GeometryHeron’s Formula
A = √(s(s−a)(s−b)(s−c))
Area of a triangle from three side lengths.
Open formula →GeometryPythagorean Theorem
c² = a² + b²
Relates side lengths of a right triangle.
Open formula →TrigonometrySine Ratio
sin θ = opposite/hypotenuse
Right-triangle sine ratio.
Open formula →TrigonometryCosine Ratio
cos θ = adjacent/hypotenuse
Right-triangle cosine ratio.
Open formula →TrigonometryTangent Ratio
tan θ = opposite/adjacent
Right-triangle tangent ratio.
Open formula →TrigonometryLaw of Sines
a/sin A = b/sin B = c/sin C
Relates sides and opposite angles in any triangle.
Open formula →TrigonometryLaw of Cosines
c² = a² + b² − 2ab cos C
Generalizes the Pythagorean theorem to any triangle.
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