Page 74 - Year 11 Knowledge Organiser

Maths Higher: Similarity and Congruency: 1 of 11

Topic/Skill Definition/Tips Example Your Turn

Congruent Shapes are congruent if they are
Shape identical - same shape and same
size.

Shapes can be rotated or reflected
but still be congruent.

Congruent 4 ways of proving that two triangles
Triangles are congruent:

1. SSS (Side, Side, Side)
2. RHS (Right angle, Hypotenuse,
Side)
3. SAS (Side, Angle, Side)
4. ASA (Angle, Side, Angle) or AAS

ASS does not prove congruency.

Similar Shapes Shapes are similar if they are the
same shape but different sizes.

The proportion of the matching sides
must be the same, meaning the
ratios of corresponding sides are all
equal.