4.G.1

Draw points, lines, line segments, rays, angles (right, acute, and obtuse), and perpendicular and parallel lines.

Lesson 4.G.1

Concepts addressed:

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

• Be able to draw and identify some of the basic two-dimensional figures using parallel and perpendicular lines

• Be able to draw and identify some of the basic two-dimensional figures using line segments and angles

Key terms in this lesson

• 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)

Points, lines, line segments, and rays

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