Lesson Plan: Lesson plans were written by Maryland mathematics educators and could be used when teaching the concepts. 
Goal 2 Geometry, Measurement, And Reasoning 
Expectation 2.2 The student will apply geometric properties and relationships to solve problems using tools and technology when appropriate. 
Indicator 2.2.3 The student will use inductive or deductive reasoning. 
Lesson Plan 

Concurrent Lines in Triangles 
Approximate Time: Two to three 50minute lessons or one to two 90minute lessons
Objective: The student will investigate points of concurrency in triangles and apply these concepts to realworld situations. 
Lesson Plan 
Constructions, Sketches, and Drawings 
Approximate Time: One 45minute lesson and a followup for 20 minutes in a subsequent lesson.
Objective: For the students to understand the difference between constructions, sketches, and drawings. 
Lesson Plan 
Coordinate Proofs 
Approximate Time: 50minute lesson
Objective: The student will use analytic geometry to write coordinate proofs involving midpoint, slope and distance. 
Lesson Plan 
Different Methods of Construction 
Approximate Time: Two to three 50minute lessons or one to two 90minute lessons
Objective: For the students to be able to perform geometric constructions using a variety of construction tools, investigate the properties of perpendicular bisectors and angle bisectors, and apply geometric constructions to reallife situations. 
Lesson Plan 
Flow Chart Proofs 
Approximate Time: 50minute lesson
Objective: Students will be able to identify and apply properties of equality and properties of congruence, write flow chart proofs for organizing deductive arguments, and validate properties of geometric figures and explain the processes used. 
Lesson Plan 
Justification in Proof 
Approximate Time: 50minute lesson
Objective: Students will be able to identify and apply properties of equality and properties of congruence, and validate properties of geometric figures and explain the processes used. 
Lesson Plan 
Paragraph Proofs 
Approximate Time: 50minute lesson
Objective: Students will be able to identify and apply properties of equality and properties of congruence, write paragraph proofs for organizing deductive arguments, and validate properties of geometric figures and explain the processes used. 
Lesson Plan 
Practice with Proofs 
Approximate Time: 50minute lesson
Objective: Students will be able to identify and apply properties of equality and properties of congruence, perform a variety of methods for organizing deductive arguments, and validate properties of geometric figures and explain the processes used. 
Lesson Plan 
TwoColumn Proofs 
Approximate Time: 50minute lesson
Objective: Students will be able to identify and apply properties of equality and properties of congruence, write twocolumn proofs for organizing deductive arguments, and validate properties of geometric figures and explain the processes used. 

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