A Youtube video from ProfRobBob. Note: There may be a short ad at the beginning.
Introduce Points, Lines, and Planes along with many definitions like collinear and coplanar points to begin our studies of Geometry. Parts D and E of the last example should read is there a plane in the solid that contains these 3 vertices, not if they are coplanar. Asking if they are coplanar is the same type of error corrected early in the video. Three points define a plane.
A Youtube video from ProfRobBob. Note: There may be a short ad at the beginning
Introduce the basic geometric figures of segments, rays, and distance on a number line. This lecture includes discussions about the Ruler Postulate, Segment Addition Postulate, Congruency is defined, Midpoint of a Segment, and finally Bisector of a Segment.
A Youtube video from ProfRobBob. Note: There may be a short ad at the beginning Introduce the basic structure of angles in Geometry, how to name them based on points, and size such as acute and obtuse. Also introduce the Protractor Postulate, Angle addition Postulate, define congruent angles, angle bisector, and adjacent angles.
In this video, hediscusses the basics behind parallel and perpendicular lines. He goes over the definition of both words as well as the symbol for parallel lines and perpendicular lines. He ends the video going over a few example problems that helps reinforce the concepts behind parallel and perpendicular lines.