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Welcome to the fascinating world of geometry! If the ruler postulate sounds like Greek to you, fear not; you're not alone. The journey into geometry involves learning to organize your thoughts into categories, each with specific uses. It's a new terrain that takes some getting used to, but don’t worry!  I’ve got your back.  All of my study guides have everything you need for each unit, and each one is free, downloadable, and sharable.  If you’ve read through on your own and are still feeling shaky, reach out and we can talk about getting some support in place.



While memorization is crucial, especially when grappling with questions like "what are opposite rays," or “what makes two lined perpendicular”,  success in  this subject lies in using logic to construct iron-clad arguments. Consider yourself not just a student but a high-powered lawyer, aiming for a resounding victory in the courtroom of geometric reasoning. Picture how you'll strategize and provide proof beyond any shadow of a doubt for your arguments.

To get started, there are some key concepts you'll encounter: undefined terms, defined terms, postulates, theorems, and corollaries. These are the tools of the trade, each with its own unique job. Let's delve a bit deeper. 

Undefined Terms:

These are the foundational concepts of geometry that are left intentionally undefined because they arent really anything out side of the context or a larger shape or argument.  Terms like point, line, and plane fall into this category, and are the building blocks upon which the entire structure of geometry rests.  While you might not find a formal definition for them, they are the fundamental elements you'll work with extensively.

Defined Terms:

In contrast to undefined terms, defined terms in geometry are precisely what they sound like—terms that are explicitly defined to avoid any ambiguity. For instance, you might encounter definitions for concepts like angles, triangles, and polygons. Understanding these definitions is crucial as they provide the framework for more complex geometric ideas.


These are the fundamental assumptions or accepted truths upon which geometric reasoning is based. The ruler postulate, which might currently sound like a foreign language, is one such assumption. Postulates serve as the starting point for developing theorems and corollaries, forming the bedrock of geometric logic.


These are the statements that can be proven based on the postulates and previously proven theorems. The process of proving a theorem involves applying logical reasoning and deductive arguments. The beauty of theorems lies in their ability to unlock new insights and extend our understanding of geometric relationships.


These are like side notes or consequences that naturally follow from theorems. Once a theorem is proven, corollaries emerge, offering additional insights or applications. They are the "bonus" information that enriches your understanding of the geometric principles at play.

Again, remember  that geometry is not just about rote memorization; it's about cultivating a mindset of logical reasoning.  This approach will not only help you tackle specific problems, but also equip you with a valuable skill set applicable beyond the realm of geometry.

If the journey feels overwhelming and attempting problems independently leaves you frustrated, consider reaching out for support. A consultation can provide an opportunity to discuss your challenges and determine the level of assistance that best suits your needs. Geometry is a puzzle, and with the right guidance, you can unlock its secrets and master the art of geometric reasoning.

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