# Grinnan Geometry Chapter 3

## 16 terms

### parallel lines

two lines that do not intersect and are coplanar

### skew lines

two lines that do not intersect and are not coplanar

### parallel planes

two planes that do not intersect

### transversal

a line that intersects two or more coplanar lines at different points

### corresponding angles

two angles that have matched up positions

### alternate interior angles

they lie between the two lines and on opposite sides of the transversal

### alternate exterior angles

lie outside the two lines and on opposite sides of the transversal

### consecutive interior angles

lie between the two lines and on the same side of the transversal

### slope

is the ratio of vertical change to horizontal change between any two points on a nonvertical line

### rise

change in the y coordinates of any two points on a line

### run

change in the x coordinate of any two points on a line

### lines with congruent slopes

parallel lines in a coordinate plane

### the product of their slopes is -1

perpendicular lines

### y = mx + b

equation of a line in slope-intercept form

### ax + by = c

equation of a line in standard form

### distance from a point to a line

the length of the perpendicular segment from the point to the line