CHAPTER 24

Geometry on the GMAT

Learning Objectives

After studying this chapter, you will be able to: 

• Describe the types of geometric concepts that are frequently tested on the GMAT
• Identify the geometry rules that are relevant to a given geometry question
• Apply the Kaplan Methods for Problem Solving and Data Sufficiency to questions dealing with geometry

Below is a typical Problem Solving geometry question. In this chapter, we’ll look at how to apply the Kaplan Method to this question, discuss the geometry rules being tested, and go over the basic principles and strategies that you want to keep in mind on every Quantitative question involving geometry.

1. 

   Note: Figure not drawn to scale.

   In the figure above, ED = 1, CD = 2, and AE = . What is the perimeter of ΔABC?
   1. 
   2. 
   3. 
   4. 
   5. 

Before you move on, take a minute to think about what you see in this question and answer some questions about how you think it works:

• What types of shapes are presented in the figure?
• How does knowing that lines AB and ED are parallel help you?
• How does knowing the measure of angle BAC help you?
• What GMAT Core Competencies are most essential to success on this question?