---
title: "Completing symmetric figures"
description: "Complete a simple symmetric figure with respect to a specific line of symmetry"
canonical: https://lightmysky.com/learn/mathematics/completing-symmetric-figures-mt_hR2Y7NhMSY
source: https://lightmysky.com/learn/mathematics/completing-symmetric-figures-mt_hR2Y7NhMSY.md
retrieved: 2026-09-12
---

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# Completing symmetric figures

Complete a simple symmetric figure with respect to a specific line of symmetry

Subject: Mathematics · Area: Geometry · Ages 8 to 9
Page: https://lightmysky.com/learn/mathematics/completing-symmetric-figures-mt_hR2Y7NhMSY

## Ready when they can

- Given half a butterfly shape and a mirror line, complete the other half on a grid
- Complete a symmetric pattern on squared paper with a vertical line of symmetry
- Check a completed figure by folding along the mirror line

## Lesson: Lines of symmetry

A line of symmetry is a mirror line. If you fold a shape along this line, both halves land exactly on top of each other. You already know how shapes look and how they move on a grid. Now you will use that grid to finish a shape when you only see half of it.

*(drawing: A square folds perfectly in half along its middle line. Each side matches the other side exactly.)*

**Example.** Zara sees half a butterfly wing drawn on squared paper, with a mirror line down the middle. For every square she counts on one side, she counts the same square on the other side, the same distance from the line. She marks a dot there, then joins the dots to finish the wing.

**Tip.** To check your work, fold your paper along the mirror line. If the two halves match up exactly, your drawing is symmetrical. If a part sticks out, fix that part.

**Recap.** A line of symmetry is a mirror line: copy each square the same distance on the other side, then fold to check.

## Practice

18 questions on this page, each with its working shown.

## Needs first

- [Lines of symmetry in 2-D shapes](https://lightmysky.com/learn/mathematics/lines-of-symmetry-in-2-d-shapes-mt_hRZyKvz1KN)

## Opens up

- [Reflection and Translation on a Grid](https://lightmysky.com/learn/mathematics/reflection-and-translation-on-a-grid-mt_efOeaGFyGM)
- [Transformations on a grid](https://lightmysky.com/learn/mathematics/transformations-on-a-grid-mt_SH7QgFl8-v)