wunder beta📏 Classifying Shapes by Their Lines
Sort shapes using their lines — parallel sides, perpendicular sides, and lines of symmetry.
What you’ll learn
- Parallel and Perpendicular LinesDefine parallel lines, perpendicular lines, and lines of symmetry.Lines can relate in special ways. Parallel lines stay the same distance apart and never meet, like railway tracks. Perpendicular lines cross at a right angle of 90 degrees, like a window's cross frame. A line of symmetry splits a shape into two matching halves.
- Sorting Shapes by Their LinesClassify shapes by their parallel sides, perpendicular sides, and lines of symmetry.You can sort and describe shapes using their lines. A square has two pairs of parallel sides, perpendicular corners, and 4 lines of symmetry; a rectangle has 2 lines of symmetry; a right-angled triangle has perpendicular sides but no parallel sides. Asking 'does it have parallel sides?' is a quick way to sort shapes.
Questions this course answers
Parallel lines are lines that…
Parallel lines run side by side, always the same distance apart, and never touch.
Perpendicular lines cross each other at…
Perpendicular lines meet at a right angle, exactly 90 degrees.
A line of symmetry does what to a shape?
A line of symmetry divides a shape into two halves that mirror each other.
How many lines of symmetry does a square have?
A square has 4 lines of symmetry — up-and-down, side-to-side, and both diagonals.
Which shape has parallel sides?
A rectangle has two pairs of parallel sides; a triangle has none.
A right angle, where perpendicular lines meet, measures…
Perpendicular lines meet at a right angle of 90 degrees.
Grounded in trusted sources
- Khan Academy Kids
- BBC Bitesize — KS2 Maths
- NRICH — University of Cambridge
- Britannica Kids
Every Wunder lesson is built from real, reputable sources — never invented.
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