Chapter 6

Question 1

plane

Answer 1

a flat surface

Question 2

four ways to determine a plane

Answer 2

three noncolinear points
a line and a point not on the line
two intersecting lines
two parallel lines

Question 3

colinear

Answer 3

on the same line

Question 4

noncolinear

Answer 4

not on the same line

Question 5

if a line intersect a plane not containing it

Answer 5

then it intersects the plane at exactly one point

Question 6

foot

Answer 6

point of intersection of a line and a plane coplanar on the same plane

Question 7

if two planes intersect

Answer 7

then their intersection is exactly one line

Question 8

if a line is perpendicular to a plane

Answer 8

then it is perpendicular to every line that passes through its foot

Question 9

two types of perpendicularity

Answer 9

between 2 lines segs or rays

between a line and a plane

Question 10

if a line is perpendicular to two distinct lines that lie in a plane and pass through its foot

Answer 10

then it is perpendicular to the plane