Two-dimensional (2D) shapes are completely flat. They cannot be picked up. 2D shapes can be found printed in a book or you can draw them on a piece of paper. 2D shapes have sides and corners (also ...

The perimeter is the distance around the outside of a 2D shape. The distance can be measured in units like millimetres, centimetres, metres and kilometres. To work out the perimeter, add up the ...

Rainbows are actually full circles, but we usually only see an arc because the Earth's surface blocks the bottom half. To view a complete circular rainbow, one must be high in the sky, like in an ...