Explore the triangle area formula, its derivation, and practical examples to master this essential geometric concept effortlessly.

Learn how to calculate the areas of rectangle, triangle, and circle in Excel for a single cell or range of cells usin this formula.

A demonstration of how to calculate the perimeter and area of simple and compound shapes with the help of the crow and Detective Stinker.

The outside edge of a shape is known as the perimeter. Learn how to work out the perimeter of a 2D shape with this Year 4 article from BBC Bitesize.