Perimeter & Area Calculator for Plane Shapes
Perimeter & Area Calculator of Plane Figures P, S
Choose a figure and enter its dimensions. For trapezoids and parallelograms, the side lengths are only needed for the perimeter.
The calculator above computes the perimeter and area of common plane shapes: rectangle, square, trapezoid, parallelogram, and rhombus.
Formulas used
Rectangle: S = ab, P = 2(a + b)
Trapezoid: S = (a + b)h / 2
Rhombus: S = d₁d₂ / 2
- Parallelogram: S = base × height.
- Use the same unit for every length; area is in square units.
Worked example
Trapezoid with bases 6 and 10, height 4:
S = 32
Enter the same values in the calculator above to see every step of the solution.
How to use the calculator
- Choose the shape and enter its dimensions.
- Press the calculate button. The result appears instantly.
- Read the step-by-step solution, rendered with KaTeX, to check your own work.