1.1 Identify Points, Lines, and Planes

Undefined Terms POINT point A LINE 1 MN PLANE 2 plane DEF Dimensions Representation Name POINT point A A LINE 1 MN M N PLANE D E 2 plane DEF F Lines – any 2 points define a line. Planes – any 3 non-collinear points define a plane.

Definitions Collinear – points on the same line. Coplanar – points… on the same plane.

Defined Terms SEGMENT RAY OPPOSITE RAYS Term Representation Name AB CD FE and FG E F G

Definitions Segment – a part of a line with two endpoints. Ray – a part of a line with one endpoint that goes infinitely in one direction. Opposite Rays – a pair of rays that 1) share an endpoint 2) together form a line.

Intersections The intersection of two lines is a POINT. The intersection of two planes is a LINE. The intersection of a plane and a line is a POINT.

Yes, any three points define a plane. QW, line g Give two other names for WQ. Give two other names for plane V. Name three points that are collinear. Then name a fourth point that is not collinear with these three points. Name a point that is NOT coplanar with R, S, and T. Is point W coplanar with points Q and R? Explain. plane QST, plane RST R, Q, S ; T W g S Yes, any three points define a plane. W f Q R T V

What is another name for ZY? Name all rays with endpoint V. Name two pairs of opposite rays. Give another name for WV. What is another name for ZY? Name all rays with endpoint V. Name two pairs of opposite rays. Give another name for WV. YZ VZ, VY, VW, VX VW & VX, VZ & VY WX W Y V X Z