Geometry and Measures

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Line of Symmetry

Geometry and Measures Line of Symmetry

🎬 Video Tutorial

  • (0:01) Definition of Line of Symmetry: A line of symmetry divides a shape into two identical, mirror-image halves.
  • (0:24) Reflection Symmetry: Shapes like rectangles, squares, and circles have reflection symmetry because they have at least one line of symmetry.
  • (2:27) Mirror Points: Every point on one side of the line of symmetry has a corresponding mirror point on the other side, at equal distance from the line.
  • (3:01) Completing Shapes with Symmetry: Measure and mirror all vertices across the line of symmetry, then connect them.

📂 Revision Cards

A diagram explaining a line of symmetry using a heart shape, with text explaining that when folded along the line, both halves will match perfectly.
1) What is a Line of Symmetry
Diagram showing lines of symmetry in common shapes: rectangle (2), square (4), isosceles triangle (1), equilateral triangle (3), circle (infinite).
2) Lines of Symmetry in Common Shapes
Four road signs are checked for whether they have reflection symmetry.
3) Check for Reflection Symmetry
Diagram showing a pentagon with a vertical line of symmetry and demonstrating two key features of a line of symmetry.
4) Key Feature of Line of Symmetry
Step-by-step guide on completing a shape using a line of symmetry, showing the instructions to measure, locate, and connect key points.
5) Complete a Shape Given Line of Symmetry

🍪 Quiz

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