Named by a capital letter A k Named

Named by a capital letter. A k Named by a lower case script letter, or two points on the line. Line A AB Named by a capital script letter or by 3 non-collinear points. Q D k B o r BA E F Plane Q, DEF, FED, EDF, EFD Star, city on a map, bulls eye Straw, mop handle, flag pole Floor, piece of paper, soccer field

critical attributes is the classification are the critical attributes that make this definition different from other definitions.

Space Collinear Non-collinear Coplanar Non-coplanar Skew Lines Parallel Lines

point line point

Infinitely many One 6 (BC, CB, DB, BD, DC, CD)

EF, HJ, GE Three lines, AB, BC and CA Ex: Plane B, XYZ, YZX, ZXY Ex: UR, ST, TR

No, the points are not collinear because they form two distinct lines. No, the points are not coplanar because they're not on the same flat surface. There are 5 planes in the figure. ABE, AED, ADC, ABC and F Point A Point E Line ED

Yes CDHG No ABDH

Plane QRS & RST YES NO

Yes, they're coplanar because they can be contained in the same flat surface Yes, they're collinear because any two points create one unique line. No, they're not collinear because they can't be contained in one line. Yes, they're coplanar because any 3 non-collinear points always create a unique plane. The intersection of NM and LM is point M. The intersection of NM and QN is point N. The intersection of plane K and line LM is point M. The intersection of plane K and plane NMR is line NM.

Parallel Intersecting Parallel Skew No Yes