# 7.9: Study Guide

**At Grade**Created by: CK-12

Keywords: Define, write theorems, and/or draw a diagram for each word below.

**\begin{align*}1^{st}\end{align*} Section: Ratios & Proportions**

Ratio

Proportion

Means

Extremes

Cross-Multiplication Theorem

Corollary

Corollary 7-1

Corollary 7-2

Corollary 7-3

Corollary 7-4

Corollary 7-5

**Homework:**

**\begin{align*}2^{nd}\end{align*} Section: Similar Polygons**

Similar Polygons

Scale Factor

Theorem 7-2

**Homework:**

**\begin{align*}3^{rd}\end{align*} Section: Similarity by AA**

AA Similarity Postulate

Indirect Measurement

**Homework:**

**\begin{align*}4^{th}\end{align*} Section: Similarity by SSS and SAS**

SSS Similarity Theorem

SAS Similarity Theorem

**Homework:**

**\begin{align*}5^{th}\end{align*} Section: Proportionality Relationships**

Triangle Proportionality Theorem

Triangle Proportionality Theorem Converse

Theorem 7-7

Theorem 7-8

**Homework:**

**\begin{align*}6^{th}\end{align*} Section: Dilations**

Dilation

**Homework:**

**Extension: Self-Similarity**

Self-Similar

Fractal

**Homework:**

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