Perimeter of Plane Shapes | Mills Maths Tools

Perimeter of Plane Shapes

The shape

Shape Units

Missing sides

Leave some sides unlabelled What’s missing

Click a ? side and the working flies across the figure. On a composite this is either the shorter sides adding to a long one, or the other pieces taken off it — every other shape uses an equal side.

On screen

Running total & addition Formula reveal at the end Predict first Edit side lengths Equal-side marks Right-angle marks

Rectangle

MA4-LEN-C-01

Perimeter

Space traces the perimeter · R for new numbers · N for a new shape · Esc to start again.