Class 7 · Ganita Prakash
Unit 9 · Class 7Ganita Prakash
Geometric Twins (Similarity)
Congruent and similar shapes: what stays the same.
Lessons
3 concepts
- 1CongruenceTwo triangles are congruent if their corresponding sides and angles are equal. Symbol: .
- 2SimilaritySimilar shapes have equal angles but scaled sides. Ratio of corresponding sides = scale factor .
- 3ApplicationsMaps use similarity — scale means real length is map length. Enlargements and reductions.
Skills to practise