Congruence and similarity
Prove congruence using SSS/SAS/ASA/RHS; use similarity to find missing lengths and areas
What you'll learn
- 1
Imagine two identical puzzle pieces that fit perfectly together — they are the same shape and the same size.
- 2
If two shapes are congruent, what must be true about them?
- 3
Here are two triangles. One is a copy of the other — they are congruent. The third triangle is a zoomed-in version — it is similar.
- 4
Are these two rectangles congruent?
- 5
Drag the second triangle to see if it matches the first exactly — that's congruence.
- 6
Two shapes are similar. Their angles are the same, but one side is twice as long. Are they similar or congruent?
- 7
Triangle A has sides 3 cm, 4 cm, 5 cm. Triangle B has sides 6 cm, 8 cm, 10 cm. Are they similar?
Practise Congruence and similarity with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 14–16. Aligned to the UK National Curriculum.