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 ...

Perimeter doesn’t have to be hard! Learn how to calculate it quickly for any shape — with tricks they never taught you in school. #PerimeterHack #MathTips #GeometryMadeEasy ...

Want to calculate the radius of a circle from its area or perimeter? Here are the key formulas that no one explains clearly! ...