 In this video we're going to look at similar and congruent shapes. Similar and congruent shapes are seen throughout design and make it much easier. In this image only two shapes have been drawn and then by changing the size and orientation of these shapes we have a detailed design. So what is the difference between similar and congruent? Pause the video and have a think. Similar snakes, they are identical but just a different size. Think, snakes have scales so similar are scaled up or down versions of one another. They can also be rotated or reflected. Similar shapes however must be the exact same size. They can only be rotated, reflected or moved. Think congruent cars. These cars are all identical but just a different point on a junction. So congruent shapes are also similar but similar shapes aren't congruent. Which of these shapes are congruent and which are similar? Pause the video and work it out. Did you get it right? In another video we'll look at how to use similar shapes to make calculations easier. For now you just need to remember that congruent shapes are the exact same size but can be rotated, reflected or moved. Congruent cars, whereas similar shapes can also be different sizes. The sides are just increased or decreased by the exact same ratio. Similar snakes.