Lesson Objective

Lesson Objective Identify triangles by their angles.

What you already know!!!!! You have already learned different types of angles. Right angle Acute angle

Concept Right Triangle- one right angle

Concept Obtuse Triangle- one angle greater than a right angle

Concept Acute Triangle- three angles less than a right angle

Example  Right Triangle

Example  Acute Triangle

Non-Example  Right Triangle

Non-Example  Obtuse Triangle

Importance • Understanding different types of triangles will help you with passing the district and state test. • If you want to get a job as a builder you need to know the different types of triangles that would work for different structures

Skill Steps: • Look at the triangle. • Ask does this triangle make a right angle? (if yes then you have a right triangle, if no continue) • Ask is the triangle smaller or bigger than a right triangle? If smaller than you have an acute triangle, if bigger than you have an obtuse triangle.

Model Problems on the board

Practice Obtuse Triangle

Practice Acute Triangle

Practice Right Triangle

Closure • What was our objective for the day? • Why is it important to learn about different triangles? • What is this triangle called?

Lesson Objective