1. Always follow the line. Dottie, the red bug, walked too far by wobbling all over the line. You must follow the edge of the shape exactly to find the perimeter. 2. Don't cut any corners. Trio, the ...

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 ...