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Line of Symmetry and Reflection Symmetry

Geometry and Measures Line of Symmetry and Reflection 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

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