Math Formula Encyclopedia
Search, understand, and use formulas across arithmetic, algebra, geometry, trigonometry, calculus, statistics, finance, science, engineering, and everyday math.
18 matching formulas
Rectangle Area
Area enclosed by a rectangle.
Open formula →GeometryRectangle Perimeter
Distance around a rectangle.
Open formula →GeometryTriangle Area
Area of a triangle.
Open formula →GeometryHeron’s Formula
Area of a triangle from three side lengths.
Open formula →GeometryPythagorean Theorem
Relates side lengths of a right triangle.
Open formula →TrigonometrySine Ratio
Right-triangle sine ratio.
Open formula →TrigonometryCosine Ratio
Right-triangle cosine ratio.
Open formula →TrigonometryTangent Ratio
Right-triangle tangent ratio.
Open formula →TrigonometryPythagorean Identity
Fundamental identity connecting sine and cosine.
Open formula →TrigonometryLaw of Sines
Relates sides and opposite angles in any triangle.
Open formula →TrigonometryLaw of Cosines
Generalizes the Pythagorean theorem to any triangle.
Open formula →TrigonometryDegrees to Radians
Converts degrees to radians.
Open formula →TrigonometryRadians to Degrees
Converts radians to degrees.
Open formula →GeometryRegular Polygon Interior Angle Sum
Common reference identity or relationship used in geometry.
Open formula →GeometryRegular Polygon Interior Angle
Common reference identity or relationship used in geometry.
Open formula →GeometryRegular Polygon Exterior Angle
Common reference identity or relationship used in geometry.
Open formula →TrigonometryDouble-Angle Sine
Common reference identity or relationship used in trigonometry.
Open formula →TrigonometryDouble-Angle Cosine
Common reference identity or relationship used in trigonometry.
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