**Lesson 2-2 Bi-Conditional Statements.**

*An Angle is a right angle*

**if and only if**it has a measure of 90 degrees.**Copy the Standard(s) and Essential Question(s)**

__Step1__:

**Standard(s):**G.CO.9 Students know how to justify steps taken when applying postulates and theorems.

**Essential Question(s):**What is a BiConditional statement? What makes a definition good?

**Watch the videos on Biconditonals and good definitions. Make sure you have notes on the following!**

__Step2__: