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Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 3 Naming Angles Acute Angle less than 90° Right Angle 90° Obtuse Angle greater than 90° Hint: Have students use the corner of their scratch paper.  If the corner matches or lines up with the angle it is “right”!  If the corner leaves part of the angle showing, it is “obtuse” open.  If the angle doesn’t show when the corner is set on the vertex, the angle is “acute”. It is tiny or “cute”. Chapter 12 Lesson 1

Copyright ©, Long Beach Unified School District. All rights reserved. - Grade 3 Polygons Triangle 3 sides Quadrilateral 4 sides Pentagon 5 sides Hexagon 6 sides Octagon 8 sides Hint: Count the sides. Don’t expect a common shape! 1 3 2 3 2 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 1 1 4 4 4 4 4 4 4 4 2 3 1 5 5 5 5 5 5 1 6 6 6 6 7 7 8 8 Chapter 12 Lesson 3

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