4.G.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.

Lesson 4.G.2

Concepts addressed

• 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.

• Understand and identify parallel and perpendicular lines in a shape or a set of lines, line segments, and/or rays

• Being able to identify the two-dimensional

Key terms addressed:

• Quadrilaterals - shapes that have four sides and four right angles

• Point - a point in geometry is a location. It has no size i.e. no width, no length and no depth. A point is shown by a dot.

• Line - a line can be defined as a straight one-dimensional figure that has no thickness and extends endlessly in both directions.

• Line segment - a line segment is a piece or part of a line having two endpoints. Unlike a line, a line segment has a length.

• Ray - a ray is a line with a single endpoint

• Parallel lines - lines that are adjacent to each other and keep on going in the same direction, they will never end

• Perpendicular lines - lines that intersect each other (but they intersect each other at exactly a 90-degree angle)

Shapes, points, rays, lines, and line segments!

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