Angles By: Emily Angleberger
Vertex • Each angle has a vertex. • A vertex is the point where two rays meet and form an angle Ray 1 Vertex Ray 2
Naming Angles A ABC CBA B B C • You can name an angle by all three points, with the vertex in the center. • Or you can use just the letter of the vertex.
Let’s Name These Angles • Write the name of these angles in three different ways. EFD ABC E A DFE CBA F B B C F D HIG GIH JLK H K I J KLJ L I G L
Classifying Angles An acuteangle measures less than 90°. A right angle measures exactly 90°. An obtuse angle measures more than 90°.
Classify These Angles Acute, Obtuse, or Right Obtuse Acute Acute Right
Let’s Measure Angles! • http://www.amblesideprimary.com/ambleweb/mentalmaths/protractor.html