Similarity and congruence

What you'll learn

1. 1

   Imagine two identical photocopies of your favourite photo. They're exactly the same shape and size — that's congruence!

2. 2

   If two shapes are congruent, what must be true?

3. 3

   Here are two triangles. They have all matching sides and angles — they are congruent.

4. 4

   Drag the second triangle to see if it fits exactly over the first one. That's congruence!

5. 5

   Let's check if these two rectangles are congruent.

6. 6

   If shape A has sides 5cm, 5cm, 8cm and shape B has sides 4cm, 5cm, 8cm, are they congruent?

7. 7

   Similar shapes are like enlargements — same shape but different size. Think of a small photo and a poster of the same picture.