Secondary Maths (KS3–GCSE)
Text Lesson
Area and Perimeter
Calculate the area and perimeter of rectangles, triangles and compound shapes.
Study Duration
15 Min
Perimeter is the total distance around the outside of a shape, while area measures the space inside it. For a rectangle, area = length × width — so a 6cm by 4cm rectangle has an area of 24cm².
We also cover the area of a triangle (½ × base × height) and how to break compound shapes into simpler rectangles and triangles to find their total area.
