Area and perimeter
Area is how big a surface is, and perimeter is how far it is all the way around. Choose the shape, enter the measurements, and see both the answer and how it is calculated.
Your numbers
Answer
Area
24cm²
Circumference
20cm
Area in m²
0.0024m²
How to work it out
- 1A = l · b = 6 · 4 = 24 cm²
- 2O = 2 · (l + b) = 2 · (6 + 4) = 20 cm
The formula
A = l · b
Length times width.
O = 2 · (l + b)
All four sides added together.
Area is always measured in square units: cm², m² … Perimeter is a length and is measured in cm, m …
More: Geometry
- PythagorasFind the missing side of a right triangle — with a drawing and working.
- Volume and surface areaBox, cube, cylinder, cone, sphere and pyramid — also in litres.
- The circleRadius, diameter, circumference and area from one known measurement — and sectors.
- Right triangleSine, cosine and tangent: all sides and angles from two known values.
- AnglesThe third angle in a triangle and the angle sum of a polygon.
- Points in the coordinate systemDistance, midpoint and the line between two points — drawn in.