Identifying lines of symmetry in 2D shapes and completing symmetrical figures.
Where your child meets this in real life: Recognising symmetry in logos, flags, butterflies, and architectural designs
Each SEAG paper has 28 maths questions. Questions 29 to 50 are multiple choice with five possible answers, and questions 51 to 56 need a short written answer. With 56 questions in 60 minutes across English and maths, that is about a minute per question.
SEAGReady breaks lines of symmetry into 3 steps, taught in order so each skill builds on the last.
Identify a vertical or horizontal line of symmetry in common 2D shapes
Find all lines of symmetry in shapes including diagonal lines
Complete a shape by drawing its reflection across a given mirror line
Try three free questions from our lines of symmetry course. They start easy and get harder, so you can see where your child's confidence runs out. If they manage the last one without a hint, this topic is probably secure. If not, the steps above show where to start.
Sean is designing a badge for his scout group. He draws an isosceles triangle. Does the isosceles triangle have a line of symmetry?
Abigail looks at a rectangle that is not a square (the sides are different lengths). How many lines of symmetry does this rectangle have?
Grace is completing a symmetrical star shape. The vertical mirror line is at x = 5. One point is at (1, 4) and another point is at (3, 7). After reflecting both points, what is the total of all four x-coordinates (original and reflected)?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
An isosceles triangle is shown.
Does this isosceles triangle have a line of symmetry? If so, where is it?
A line of symmetry divides a shape into two halves that match exactly when folded
Step 1 of 3
An isosceles triangle is shown.
Does this isosceles triangle have a line of symmetry? If so, where is it?
The isosceles triangle has one line of symmetry running from the top vertex straight down to the middle of the base.
The key insight: The folding test always works - if both halves match when folded, it is a line of symmetry!
Common mix-up: Drawing a horizontal line through the middle. A horizontal line would not create matching halves - the top and bottom of the triangle are different shapes.
These are the misconceptions we see most often in lines of symmetry, including the ones our practice questions are specifically designed to catch.
Struggling with lines of symmetry? The real gap is often in one of these earlier topics.
Sitting the SEAG test this November? Read our last-month revision plan, Paper 1 vs Paper 2 and test day guide.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.
Free to start · no card needed