• Angle Basics

    Fourth graders can identify the relationship between two or more lines as parallel or intersecting. A special kind of intersection is when lines are perpendicular. Look for right angles and you will know the lines are forming perfect 90 degree angles.


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  • Angles and Degrees

    Fourth graders can identify angles as acute, right, or obtuse. Using a protractor correctly to measure angles 180 degrees or less is a fourth grade skill.


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Last Modified on September 22, 2017