Unit 2 Flashcards
What is the definition of perpendicular?
2 lines, rays or segments that intersect to form right angles
What is the symbol for perpendicular?
⊥
What is a perpendicular bisector?
A line, ray or segment that intersects a segment at its midpoint, and forms right angles
When you see “perpendicular bisector,” what should you mark immediately?
Congruent segments and right angles
What determines the distance from a point to a line?
The length of the perpendicular line segment
What is true about any point on an angle bisector?
It is equidistant to both sides of the angle
What is true about any point on a perpendicular bisector of a segment?
It is equidistant to the endpoints of the line segment
What does equidistant mean?
Equal (or same) distance
What is the definition of parallel lines?
2 coplanar lines that do not intersect
What is the symbol for parallel?
||
How do you mark lines parallel?
With the same number of arrows
What is the definition of skew lines?
Two noncoplanar lines (that do not intersect)
What is the slope intercept formula?
y = mx + b
What is the slope of any vertical line?
Undefined
What is the slope of any horizontal line?
0
What is the form of the equation of any vertical line?
x = a (a number)
What is the form of the equation of any horizontal line?
y = b (a number)
What is true about the slopes of parallel lines (on a graph)?
They are equal (the same)
What is true about the slopes of perpendicular lines (on a graph)?
They are opposite reciprocals (negative reciprocals)
To find the equation of a line, what formula do you use?
Point-slope formula
How do you find the length of a line segment on a Cartesian graph?
Use the distance formula
How do you find the distance between any two points on a Cartesian graph?
Use the distance formula
How do you find the coordinates of the midpoint of a line segment on a Cartesian graph?
Use the midpoint formula
What is the point slope formula?
y - y1 = m(x - x1)
If an equation is in standard form (Ax + By + C = 0) What is the formula for slope?
m = -A/B
What is the midpoint formula on a Cartesian graph?
((x1 + x2)/2 , (y1 + y2)/2)
What is the distance formula on a Cartesian graph?
d = √(x2 - x1)² + (y2 - y1)²
