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Grade 7
Shape and Space
15. SS7.5
15.2 Tessellations using rotations
Tessellations using rotations
What You'll Learn
Calculate the number of sides in a polygon using its rotational symmetry angle
Identify regular polygons by dividing 360 degrees by the rotation angle
Determine all lines of reflection symmetry for various polygons
Distinguish between regular and irregular polygons when finding symmetry lines
Apply the relationship between rotational symmetry and polygon structure
What You'll Practice
1
Finding polygon names from rotational symmetry angles (30°, 45°, 120°, 180°)
2
Drawing lines of reflection symmetry on triangles, squares, and pentagons
3
Identifying symmetry differences between regular and irregular hexagons
Why This Matters
Understanding rotational and reflection symmetry helps you recognize patterns in geometry, art, and architecture. This foundational concept connects to transformations in algebra and is essential for advanced topics like tessellations, trigonometry, and design applications.
Before You Start — Make Sure You Can:
This Unit Includes
8 Video lessons
Skills
Rotational Symmetry
Reflection Symmetry
Polygons
Transformations
Geometry
Angle Measurement
SK Curriculum Aligned