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Geometry worksheet to help students classify triangles as acute, right, or obtuse.

Activity 3.8​

​Assignment 3.13

​Classifying Triangles: Angles

 
Objectives
Classify triangles by angles as acute, right, or obtuse.
 
Name the right angles, acute angles, legs, and hypotenuses of right triangles.
 
 
 

Assignment 3.9

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Geometry worksheet to help students identify the legs, hypotenuse, and acute angles in right triangles; and classify triangles in two ways: by congruent sides and kind of angles.

About Geometry Worksheet Assignment 3.13:     

 

Assignment 3.13 is an introduction to classification of triangles by types of angles.  

 

Prerequisite Skills: Name line segments (Assignment 1.12).  Name angles (Assignment 2.4).  Identify right angles (Assignment 2.10).  Classify triangles by congruent sides (Assignment 3.12).

 

Definitions:  A triangle with all acute angles is an acute triangle.

                           A triangle with a right angle is a right triangle.  The perpendicular sides of a right triangle are its legs.  The other side is the hypotenuse.

                           A triangle with an obtuse angle is an obtuse triangle.

                         

Theorem:     In a right triangle, one angle is a right angle and the other two angles are acute..

                                                                                                         

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