We can draw points, lines, line segments, rays, and angles, if we understand their definitions. A point is an exact location in space. A line continues in both directions without end, with an arrowhead on each end. A line segment is part of a line that is between two points. A ray is part of a line that has only one endpoint, and continues without end in the other direction, shown by an arrowhead. An angle is formed by two rays or two line segments that share the same endpoint called a vertex. Angles are classified by the size of the opening between the rays. Right angles form a square corner. Straight angles form lines. Acute angles are less than a right angle. Obtuse angles are greater than right angles. We can classify an angle by comparing it to a right angle. We can name lines and line segments in two ways, starting with either point. A ray can contain a line segment, and a line can contain a line segment. We use a given figure to name a line segment, acute angle, right angle, and obtuse angle. We draw and label examples of figures given in geometric notation. We use a figure to name a right angle, line segment, acute angle, obtuse angle, and a ray. We list the angles in a given figure.

4th Grade Math Playlist
   • 4th Grade Math Course  

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

YouTube rating for JoAnn's School videos:
L0 No strong language
N0 No nudity
S0 No sexual situations
V0 Not violent or disturbing
D0 No drug reference or content
F0 No flashing lights content

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