A plane is a flat surface that continues without end in all directions. Intersecting lines are lines in a plane that cross at exactly one point. Intersecting lines form four angles. Parallel lines are lines in a plane that are always the same distan…
A plane is a flat surface that continues without end in all directions. Intersecting lines are lines in a plane that cross at exactly one point. Intersecting lines form four angles. Parallel lines are lines in a plane that are always the same distance apart. Parallel lines never intersect, they never cross or meet. Perpendicular lines are lines in a plane that form four right angles. Intersecting lines and perpendicular lines cross at one point. But, only perpendicular lines form four right angles. Parallel lines are never perpendicular because they never intersect. Two rays can be parallel because a ray is part of a line. Two rays can be perpendicular. We look at a figure and name a pair of perpendicular lines, and a pair of lines that appear to be parallel. We discuss how sometimes lines appear to be parallel, but they're not. We show how we might be able to extend the lines to see if they'll intersect. We can identify and draw parallel and perpendicular lines by using their definitions. If a figure has a square corner symbol in one of its angles, we know that the angle is a right angle and the lines that make the angle are perpendicular. We see if we can find some capital letters that have intersecting lines that are perpendicular and form right angles. We see how squares and rectangles contain parallel and perpendicular lines.
4th Grade Math 10.1, Lines, Rays, and Angles
https://youtu.be/EzdoXfoz0d0
4th Grade Math 10.2, Classify Triangles by Angles
https://youtu.be/o2rfDufQi8Q
4th Grade Math Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn
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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