1. Fourth Grade Geometry Fun with Native American Art

2. Geometry Objectives (4.8) Geometry and Spatial Reasoning: A. Identify right, acute, and obtuse angles B. Identify models of parallel and perpendicular lines C. Describe shapes and solids in terms of vertices, edges, and faces (4.9) Geometry and Spatial Reasoning: A. Demonstrate translations, reflections, and rotations

3. Acute Angles Can you identify an acute angle on this Native American work of art?

4. Acute Angle Highlighted in red shows one example of an acute angle in this picture. An acute angle measures less than 90 degrees.

5. Obtuse Angles Can you identify an obtuse angle in this Native American art?

6. Obtuse Angle Highlighted in red is one of the obtuse angles found in this picture. An obtuse angle measures more than 90 degrees.

7. Right Angles Can you identify a right angle in this Native American art?

8. Right Angles Highlighted in red shows one of many right angles in this picture. A right angle measures exactly 90 degrees.

9. Is this an example of a reflection, translation or rotation? Is this an example of a reflection, translation or rotation?

10. Rotation! The Native American pottery rotated through each of the four quadrants.

11. Look at this picture! Can you identify all the pictures within in the squares that have symmetry?

13. Parallel Lines Can you identify the parallel lines in this Native American art?

14. Parallel Lines Highlighted in red is an example of parallel lines Parallel lines are two or more lines that are in the same plane but do not intersect.

15. Perpendicular Lines Can you identify perpendicular lines in this Native American art?

16. Perpendicular Lines Highlighted in red is a set of perpendicular lines in this picture. Perpendicular lines are two lines in the same plane that meet at right angles.

17. Name this polygon

18. Name this polygon! Octagon An octagon is a polygon with eight sides. Can you think of other objects around your community that have the same number of sides like an octagon?

19. A stop sign! A stop sign is also an octagon. It has eight sides.