# Similar Triangles

# Geometry Terms

## Get down with the lingo

### Angle-Angle Postulate

A rule that says that if two triangles have two pairs of congruent corresponding angles, then the triangles are totally BFFs—err, similar.### Center Of Dilation

### Dilation

### Enlargement

Just like setting the Xerox machine to copy at 150%, an enlargement is when your dilation results in a bigger shape than you started with. The scale factor of the dilation will be more than one.### Image

A shape post-dilation. May or may not be grotesquely over- or under-sized.### Midsegment

A line segment that connects the midpoints of two sides of a triangle. It's half the length of and parallel to the third side.### Preimage

A shape, pre-dilation, with a predilection for preposterous predictions.### Proportion

A mathematical statement that establishes equality between two ratios. By calling themselves proportional, ratios proclaim to all that they are equivalent and deserve a nice crusty baguette just as much as the next ratio. "Liberté, égalité, geometré," as Victor Hugo so wisely wrote.### Ratio

A comparison of two quantities, written as a fraction (½), with the word "to" in between (3 to 5), or with a colon (9:2). Not to be confused with*CSI: Miami's*Horatio. Yeah!