Straight Lines Flashcards
What is the gradient of a horizontal line?
m = 0
What is the equation of a horizontal line?
y=b
What’s the equation of the x-axis?
y=0
What is the gradient of a horizontal line?
m = undefined
What is the equation of a vertical line?
x = a
What’s the equation of the y-axis?
x = 0
How do you find the size of the angle between a line and the x-axis?
m = tan °
How do you show that 3 points are collinear?
Show that m1=m2 so lines are parallel but share a common point so are collinear
Distance formulae?
AB= square root of the x coordinates squared plus the y coordinates squared
What’s a perpendicular bisector?
A line which bisects (cuts in half) a given line at right angles
What’s the median of a triangle?
A line drawn from one vertex to the midpoint of a the opposite side of the
What is the altitude of a triangle?
A line drawn from one vertex to the opposite side meeting it at right angles
How do you find the point two lines meet?
Simultaneous equations or y = y
