Welcome to My Bitesize, let's get you set up!

Add your subjects to find the right study guides, track progress and keep everything in one place.

Add my subjects
My Subjects

2-dimensional shapes - OCRArea of triangles

2-dimensional shapes are flat. The perimeter of a 2D shape is the total distance around the outside of the shape. The area of a 2D shape is the space inside the shape.

Part ofMathsGeometry and measure

Area of triangles

Find the refreshed revision resources for GCSE Maths: Area of triangles, with step-by-step slideshows, quizzes, practice exam questions, and more!

To calculate the area of a , draw a second triangle to form a rectangle.

Example

Right angle triangle with height = 4cm and width = 2cm
Two right angle triangles forming a rectangle

The area of the rectangle is 8 cm2.

Two triangles make the rectangle. The area of one triangle is half the area of the rectangle.

\(8 \div 2 = 4~\text{cm}^2\)

The area of a triangle can also be calculated using the formula: \(\text{area of a triangle} = \frac{\text{base} \times \text{height}}{2}\)

In this case:

\(\frac{2 \times 4}{2} = 4~\text{cm}^2\)

Next page
Area of parallelograms
Previous page
Area of squares, rectangles and compound shapes

More guides on this topic

Related links