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Similar triangles

Similar triangles

From the course: Test Prep: GRE

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Similar triangles

- [Voiceover] Similar triangles are like congruent triangles but not exactly. Their angle measures are the same, but their sides are not. So let's say we had a triangle that looked like that. We had a bigger triangle that looked like that. We might be able to determine they're similar if we happen to know that all their angles that corresponded were the same. So instead of using angle symbols, I'll use measures. Let's say this top angle was 65, maybe this angle's 65. Let's say that this angle here is 55 and then this is 55 and let's say that this is 60 and this is 60. So since the corresponding angles are the same, now we have determined that these triangles are similar. So there's a special thing that we can use for that. The corresponding size of these triangles will therefore have the same ratio. So let's say that I knew that this bottom side of the little baby triangle is four and let's say I knew that the bottom side of the big triangle is eight in length. From there I could say…

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