# Geom - chpt 6

## 21 terms · McDougal-Littel chapter 6

### plane

flat surface that extends in all directions such that if you choose two points on the surface, then every point on the line determined by those two points is also on the surface

### coplanar

lying on the same plane

### noncoplanar

not on the same plane

### foot

the point of intersection of a line and a plane

### determine a plane

three non-collinear points ...

### determine a plane

a line and a point not on the line ...

### determine a plane

two intersecting lines ...

### determine a plane

two parallel lines ...

### line perpendicular to a plane

a line is perpendicular to every line in a plane that goes through its foot

### it is perpendicular to the plane

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

### parallel planes

planes that do not intersect

### line parallel to a plane

a lines and a plane do not intersect

### skew

noncoplanar lines

### the lines of intersection are parallel

if a plane intersects two parallel planes, then ...

### the intersection is exactly one point

if a line intersects a plane that does not contain the line, then ...

### the intersection is exactly one line

if two planes intersect, then ...

### they are parallel to each other

if two planes are perpendicular to the same line, then ...

### it is perpendicular to the other plane, too

if a line is perpendicular to one of two parallel planes, then ...

### they are parallel to each other

if two planes are parallel to the same plane, then ...

### they are parallel to each other

if two lines are perpendicular to the same plane, then ...

### it is perpendicular to the other line, too

if a plane is perpendicular to one of two parallel lines, then ...