Undefined Terms and Definitions. Undefined Terms. Point simply a location represented by a dot named with a capital letter no shape no size. Undefined Terms (cont.). Line made up of points no thickness or width drawn with an arrowhead at each end
SL or LS
Collinear - points on the same line
Coplanar - points that lie on the same plane
Intersection – The point(s) in common among figures
Space – A boundless three-dimensional set of all points.Space can contain lines and planes.
Locus – A set of points that all satisfy a particular condition.
a. a line containing point X
Answer: line c,
b. a plane containing point ZExample 1-1d
Answer: plane P, plane XYZ, plane ZYX, plane YZX, plane XZY, plane ZXY, plane YXZ
VISUALIZATION Name the geometric shape modeled by each object.
a. a colored dot on a map used to mark the location of a city
b. the ceiling of your classroomExample 1-2d
a. How many planes appear in this figure?
b. Name three points that are collinear.
Sample answer:A, X, and Z
c. Are points X, O, and R coplanar? Explain.
Answer: Points X, O, and R all lie in plane T, so they are coplanar.
d. At what point do and intersect?Example 1-4h