Measurement and formulas
Geometry Toolkit
Choose a shape, enter its measurements, and see the formula, substitution, result, and diagram.
2D shape
Rectangle
Results
Geometry reminders
Perimeter measures distance around a 2D shape and uses linear units.
Area measures a 2D region and uses square units, such as cm².
Surface area measures the exterior of a 3D solid; volume measures its capacity in cubic units.