Area and Perimeter Calculator
Find the area and perimeter of a rectangle, a triangle (base and height, or three sides) and a trapezoid.
Rectangle
- Area
- 40
- Perimeter
- 26
- Diagonal
- 9.43398113
Triangle from base and height
- Area
- 12
Triangle from three sides
- Area
- 6
- Perimeter
- 12
Trapezoid
- Area
- 32
What is Area and Perimeter Calculator?
Area is the space inside a shape and perimeter is the distance around it. They are used in building, gardening, flooring and school geometry.
What this tool does
Four small calculators in one: a rectangle, a triangle from base and height, a triangle from three sides (Heronโs formula) and a trapezoid.
How to use it
- Find the section for your shape.
- Enter its measurements.
- Read the area and perimeter.
Did you know?
- Area is measured in square units, such as square metres, while perimeter is in plain units.
- Heronโs formula finds the area of a triangle without needing its height.