Videos, examples, solutions, and lessons to help Grade 4 students learn to draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Common Core: 4.G.1

### Suggested Learning Targets

• I can identify and draw an example of point, line, line segment, ray, angle, parallel lines, and perpendicular lines.

Lines, Line Segments, and Rays
Difference between lines, line segments, and rays.

Line Segments, Lines, and Rays
A short explanation of line segments, lines, and rays, their labels, and the differences between them.

Draw points, lines, line segments, rays, angles (right, acute & obtuse), and perpendicular and parallel lines. Identify these in two-dimensional shapes. This video relates to Common Core Standard 4.G.1. Students learn to identify right angles and straight angles as a point of reference and identify acute and obtuse angles using their definition.

Acute Right and Obtuse Angles
The difference between acute, obtuse and right angles.

### Parallel and Perpendicular Lines

Parallel sides are always the same distance apart and/or that parallel sides will never intersect if extended.
Perpendicular lines are lines that intersect at right angles.

The following activities are obtained from the Howard County Public School System.

Activity 1:
Look at the figures to the right.  In each figure, highlight one pair of parallel sides.

Kelly is having trouble identifying whether two sides in a shape are parallel to each other.  Explain how Kelly can decide if two sides in a figure are parallel.

Activity 2:
Look at the pentagon below.

Highlight two sides on the figure that are perpendicular.

Look at the angle inside the pentagon that is marked with the number 1.  Is the
angle acute, obtuse, or right?

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.