fourth grade geometry fun with native american art

Fourth Grade GeometryFourth Grade Geometry

Fun with Native American Art Fun with Native American Art

Geometry ObjectivesGeometry Objectives

• (4.8) Geometry and Spatial Reasoning: A. Identify right, acute, and obtuse anglesB. Identify models of parallel and perpendicular linesC. Describe shapes and solids in terms of vertices, edges, and faces

(4.9) Geometry and Spatial Reasoning: A. Demonstrate translations, reflections,

and rotations

Acute AnglesAcute Angles

• Can you identify an acute angle on this Native American work of art?

Acute Angle Acute Angle

• Highlighted in red shows one example of an acute angle in this picture.

• An acute angle measures less than 90 degrees.

Obtuse AnglesObtuse Angles

• Can you identify an obtuse angle in this Native American art?

Obtuse AngleObtuse Angle

• Highlighted in red is one of the obtuse angles found in this picture.

• An obtuse angle measures more than 90 degrees.

Right AnglesRight Angles

• Can you identify a right angle in this Native American art?

Right AnglesRight Angles

• Highlighted in red shows one of many right angles in this picture.

• A right angle measures exactly 90 degrees.

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

Rotation!Rotation!

The Native American pottery The Native American pottery rotated through each of the four rotated through each of the four

quadrants. quadrants.

Look at this picture!Look at this picture!

• Can you identify all the pictures within in the squares that have symmetry?

Parallel LinesParallel Lines

• Can you identify the parallel lines in this Native American art?

Parallel LinesParallel 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.

Perpendicular LinesPerpendicular Lines

• Can you identify perpendicular lines in this Native American art?

Perpendicular Lines 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.

Name this polygonName this polygon

Name this polygon!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?

A stop sign!A stop sign!

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