Discover how to work out the area of a 2D shape, by adding the length of its sides together. How do you work out the area of triangles? Discover how to work out the area of a triangle, by working ...

Let’s look at the number of sides and vertices that some 2D shapes have. Here is a triangle. Can you count the number of sides and vertices? A triangle has 3 sides and 3 vertices. Now let’s ...