Discover how to work out the area of a 2D shape, by adding the length of its sides together. Perimeter on a grid Find out about perimeter, the distance around a 2D shape, and how to work it out on ...

Laser diodes are semiconductors that generate light and amplify it using repeated reflection or "optical feedback." Once the ...

The perimeter is the distance around the outside of a closed 2D shape, space or area. You see the perimeter in real life on a football pitch or around a house to show its boundary. You can only ...