Presentation on theme: "1.4 Intersections 1.5 Segments"— Presentation transcript:
11.4 Intersections 1.5 Segments Basics of Geometry1.4 Intersections1.5 Segments
2POINT LINE PLANE LINE Review The intersection of two lines is a ___________.The intersection of two planes is a ________.Any three points can define a ___________.Any two points can define a ________.POINTLINEPLANELINE
3Review B C D A E F G H Name 4 coplanar points. Are A, D, and E coplanar?Are A, D, G, and F coplanar?Are E and F collinear?Give plane ADC another name.
4Intersections of Lines Name the intersection of andABCDEF
5Intersections of Planes Name the intersection of planes S and R.Name the intersection of planes R and T.Name the intersection of planes T and S.SRkTl
6Sketch It! P Sketch and label a plane. jPSketch and label a plane.Draw and label a line that is in the plane.Draw and label a line that does not intersect the plane.Draw and label a line that intersects the plane at one point.
7Sketch It!Sketch and label two planes that intersect.SRk
8p. 11: 8, 14, 24, 36, 38 p. 17: 16 – 32 even Assignment : First, we will discuss page 17.Then, quietly work on your own work. I will help if you need it.p. 11: 8, 14, 24, 36, 38p. 17: 16 – 32 even
9Segments A segment is a part of a line. A segment has a length. To find the length of a segment (or the distance from beginning to end), subtract the coordinates of the endpoints and take the absolute value.
10Segments ContinuedThe notation for distance is simply the endpoints of the segment.Thus, the formula for distance on a line segment is: