h basic geometry review （h基本几何复习）.pdfVIP

Basic Geometry Review Basic Geometry Review For Trigonometry Students 16 June 2010 Ventura College Mathematics Department 1 Undefined Geometric Terms Undefined Geometric Terms Point A Line AB Plane ABC 16 June 2010 Ventura College Mathematics Department 2 Halflines (Rays Halflines (Rays This is a ray named AB Point A is the “vertex” or “endpoint” of the ray; write the name of the endpoint first AB Definition: is the set of all points C on AB such that A is not strictly between B and C 16 June 2010 Ventura College Mathematics Department 3 Line Segments Line Segments The green portion is line segment AB Points A and B are “endpoints”; the distance between them is written AB (without the line segment over it Definition: AB is bounded by endpoints A and B; it contains every point on AB that is between endpoints A and B 16 June 2010 Ventura College Mathematics Department 4 Circles (1 of 5 Circles (1 of 5 Definition: A circle is the set of all points lying in a plane at a fixed distance r (the “radius”) from a given point (the “center” of the circle A “diameter” d is any line segment whose endpoints lie on the circle, and which passes through (contains) the center of the circle 16 June 2010 Ventura College Mathematics Department 5 Circles (2 of 5 Circles (2 of 5 A “secant line” is any line that touches the circle at exactly two points A “tangent line” is any line that touches the circle at exactly one point A “chord” is any line segment whose endpoints lie on the circle, but which does