A triangle is a closed shape with three sides and three vertices. The general formula to calculate the area of a triangle is half of the product of its base and height.

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

In this Maths article, learn how to calculate the area of a right-angled triangle.

We can work out the area of a triangle by working out the area of a rectangle and then dividing it by two. Discover more in this Second Level Bitesize guide.

As the changes which are being introduced, in accordance with Prof. Perry's suggestions, into geometrical teaching are giving a stimulus to the production of text-books of practical geometry and ...