perpendicular lines
A = 4,3
B = 2,2
C = 5,-4
Show that the lines AB and BC are perpendicular.
How do i do this? Do i just draw a graph or is there an equation?
B = 2,2
C = 5,-4
Show that the lines AB and BC are perpendicular.
How do i do this? Do i just draw a graph or is there an equation?
Original post by caitlindavies
A = 4,3
B = 2,2
C = 5,-4
Show that the lines AB and BC are perpendicular.
How do i do this? Do i just draw a graph or is there an equation?
B = 2,2
C = 5,-4
Show that the lines AB and BC are perpendicular.
How do i do this? Do i just draw a graph or is there an equation?
What do you know about the gradients of perpendicular lines?
Original post by 16Characters....
What do you know about the gradients of perpendicular lines?
nothing...all i know is they are right angles
Original post by caitlindavies
nothing...all i know is they are right angles
The gradients of two perpendicular lines multiply together to get -1.
Alternatively you can draw a diagram and use the converse of Pythagoras' theorem to prove that the angle made by AB and BC is a right angle.
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