Presentation on theme: "1.4 Intersections 1.5 Segments"— Presentation transcript:
1 1.4 Intersections 1.5 Segments Basics of Geometry1.4 Intersections1.5 Segments
2 POINT 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
3 Review 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.
4 Intersections of Lines Name the intersection of andABCDEF
5 Intersections 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
6 Sketch 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.
7 Sketch It!Sketch and label two planes that intersect.SRk
8 p. 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
9 Segments 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.
10 Segments ContinuedThe notation for distance is simply the endpoints of the segment.Thus, the formula for distance on a line segment is: