Perimeter Question Generator

Builds a sheet of perimeter questions at the level you ask for, with the working and the answers hidden until you want them. Every figure is chosen so the perimeter comes out whole. Every question is computed and checked directly — not a fabricated or AI-guessed fact.

How many questions

Between 1 and 30. Ten fills a page.

Level

Seed (optional)

A word reproduces the same sheet, so a whole class can be given the identical set.

Gentle is squares and rectangles. Standard adds triangles and regular polygons; stretch adds an L-shape, where the perimeter is not what most people expect.

Paper size

Print size

Margin

Millimetres of blank edge, 5 to 40.

Turn the paper sideways

Room to answer in

How to print this, or save it as a PDF

There is no PDF to download, and there does not need to be. Open the print command in your browser and choose “Save as PDF” as the destination. The page addresses and dates a browser normally prints across the top and bottom are already kept off.
Set the scale to 100%, not “fit to page”. This sheet is already the exact size of the paper you chose, so anything that resizes it makes every measurement on it wrong.
Leave the paper size in the dialog set to the same one you chose here.

Your questions will appear here.

What this generator does

Generates perimeter questions with answers, across rectangles, triangles and compound shapes. Compound shapes are where perimeter stops being a formula and becomes reasoning, because some side lengths have to be worked out from the others before anything can be added up.

How to use this tool

Choose a level and how many questions you want.
Press make questions and work through the sheet.
Show the answers to mark it, or show the working to see which rule each question uses.
Enter a seed word to rebuild the same sheet later.

Common use cases

Perimeter practice at home or school
Quick geometry warm-ups
Self-testing before a maths quiz

Randomness and fairness

Dimensions are drawn with the browser's cryptographic random number generator and then constrained: a triangle's three sides must satisfy the triangle inequality, so no question describes a shape that cannot exist. A seed word rebuilds the same sheet later; it is there for reproducibility, not cryptographic strength, and a seeded sheet is deterministic rather than unpredictable.

For how randomness is produced across the whole site, see how Generate Random works.

Limitations and good to know

There are no diagrams. The shape is described in words, which suits mental work and a printed sheet but is not the same as measuring a drawing.
Circles are not included, because a circumference brings pi in and every answer here is a whole number a pupil can check.
An L-shape is described as a rectangle with a corner removed rather than drawn, so a pupil who cannot yet picture that will need it sketching first.

Common mistakes

Confusing perimeter with area: Perimeter is the distance around the edge and is measured in units. Area is the space inside and is measured in square units. The units are the giveaway.
Missing a side on a compound shape: Count the sides before adding. Compound shapes usually have more sides than the diagram labels.