A decagon is any shape with 10 sides. The interior angles add up to 1440°. Properties of 3D shapes A sphere has 1 curved surface. A hemisphere has 1 face, 1 curved surface and 1 edge. A cone has 1 face, 1 curved surface, 1 edge and 1 vertex. A tetrahedron, or triangular-based...
Examples of 3D shapes are around us all the time. Nearly everything we see and interact with in our day to day lives is a three-dimensional shape, from Lego bricks to sunflowers. However, in the primary curriculum, children only need to know the names and understand the properties of the...