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- 4.G.A.1Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- 4.G.A.2Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
- 4.G.A.3Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.

Who Turned Out the Lights?

4th Grade Science

Â» Unit:

Energy

Big Idea:Students use lines, rays and diagrams to explain how light rays reflecting on an object help us see the object.

Angle and line art

4th Grade Math

Â» Unit:

Geometry

Big Idea:In this lesson, students create a unique art project by reviewing important geometric terms.

Points, Lines, & Planes

4th Grade Math

Â» Unit:

Geometry

Big Idea:Points, Lines, and planes are two-dimensional figures that have special attributes.

Measuring Angles

4th Grade Math

Â» Unit:

Geometry

Big Idea:Angles can be drawn and measured using a protractor.

Regular vs. Irregular Polygons

4th Grade Math

Â» Unit:

Geometry

Big Idea:Students will complete a powerpoint presentation and will explore the difference between regular and irregular polygons.

Line Segments, Rays, & Angles

4th Grade Math

Â» Unit:

Geometry

Big Idea:Lines and angles can be described with special names. A line segment has 2 end points. Angles can be acute, obtuse, right, or straight.

Acute, Obtuse, and Right Angles

5th Grade Math

Â» Unit:

Geometry

Big Idea:Kinesthetic activities help when reviewing our angle types.

Math and Art Collide - Using Protractors

4th Grade Math

Â» Unit:

Geometry

Big Idea:In this creative lesson art and math collide. Students add to a previously completed art project in order to measure angles using a protractor.

Right, Acute, & Obtuse Angles

4th Grade Math

Â» Unit:

Geometry

Big Idea:Students will learn how to use a protractor and will construct definitions for right, acute, and obtuse angles.

Math Foldables - Geometry Assessment

4th Grade Math

Â» Unit:

Geometry

Big Idea:Foldables are alternative ways to assess students in math.

Finding Angles

3rd Grade Math

Â» Unit:

Geometry

Big Idea:The three types of angles, right, acute, and obtuse, exist in our everyday surroundings. Students find these angles using classroom items.

Angle Types

5th Grade Math

Â» Unit:

Targeted Skills Interventions

Big Idea:Tangled in angles!

Tangrams with Grandfather Tang

5th Grade Math

Â» Unit:

Geometry

Big Idea:Creating rich tasks through integrating literature, positive interactions, and kinesthetic tasks when exploring geometric two dimensional shapes.

Geometry Line Vocabulary

5th Grade Math

Â» Unit:

Geometry

Big Idea:The more students are exposed to new vocabulary the more they will use it and retain it.

Triangle Types

5th Grade Math

Â» Unit:

Geometry

Big Idea:Not all triangles are created equil...lateral!

4.G.A.1

Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

4.G.A.2

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

4.G.A.3

Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.