BBC

2d shapes

Find out about regular 2D shapes and irregular polygons. Types of triangle Find out about scalene, equilateral, isosceles and right-angled triangles. Parts of a circle Discover the features of a ...
BBC

Two-dimensional shapes Area of triangles

The area of the rectangle is 8 cm 2. Two triangles make the rectangle. The area of one triangle is half the area of the rectangle.