Classifying Lines in Polygons Cut and Paste Worksheets | 4th Grade Geometry (preview: 3 of 10 pages)

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Classifying Lines in Polygons

Cut and Paste Geometry Activity Pack

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Lines in Polygons Study Guide

Understanding Parallel and Perpendicular Sides

Polygons are two-dimensional closed figures formed by straight line segments called sides. In fourth-grade geometry, we classify polygons by examining how their sides relate to one another. Parallel lines are lines in the same plane that never cross or intersect because they always stay the exact same distance apart. Shapes such as rectangles, squares, and rhombuses have two pairs of parallel sides, whereas trapezoids have exactly one pair. Perpendicular lines are line segments that intersect to form a perfect square corner called a ninety-degree right angle. When two adjacent sides in a polygon meet at a right angle, those sides are perpendicular. A rectangle has four pairs of perpendicular adjacent sides, while a right triangle contains exactly one pair of perpendicular sides.

Parallel Lines

Perpendicular Lines

Right Angle

Intersecting Lines

Explain how you can test whether two adjacent sides in a polygon are perpendicular.

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Sorting by Parallel Pairs

Classifying 2D Shapes by Parallel Sides

Cut out the shapes below and paste each into the box matching its number of parallel side pairs.