Chapter 7 of Class 5 Maths Mela, Shapes and Patterns, explores triangles, quadrilaterals, tessellation, and 3D shapes through weaving and grid activities.
Key Concepts
Triangle types: isosceles (two equal sides), equilateral (three equal sides), scalene (no equal sides).
Tessellation: covering a surface with repeating shapes leaving no gaps or overlaps — hexagons tessellate because their angles fit together exactly.
3D shapes: solids like the icosahedron (20 faces) and dodecahedron (12 faces).
Quick Recap
- An equilateral triangle has all three sides (and all three angles) equal.
- A shape tessellates only if copies of it can tile a flat surface with no gaps or overlaps.
Common Mistake to Avoid
Assuming any shape tessellates — try it on grid paper first; regular pentagons, for example, leave gaps and do not tessellate on their own.
Frequently Asked Questions
Which shapes tessellate easily?
Squares, equilateral triangles, and regular hexagons all tile a flat surface with no gaps.
What is the difference between a scalene and isosceles triangle?
A scalene triangle has no equal sides at all, while an isosceles triangle has exactly two sides equal.
Full walkthrough: Chapter 7 Solutions · Extra Questions.
