Parallel Lines
Parallel Lines
Parallel Lines
2 lines are parallel if they have the same gradient.
2 lines are parallel if they have the same gradient.
m1 = m2
Explore!
Explore!
Use the applet below to explore the relationship between the gradients of 2 parallel lines.
Use the applet below to explore the relationship between the gradients of 2 parallel lines.
Definition of Collinear
Definition of Collinear
3 points (A, B and C) are collinear if they lie on the same straight line.
3 points (A, B and C) are collinear if they lie on the same straight line.
To prove that 3 points are collinear, you need to show that the gradient of any 2 pairs of points are equal.
To prove that 3 points are collinear, you need to show that the gradient of any 2 pairs of points are equal.
mAB = mBC = mAC
Explore!
Explore!
Use the applet below to explore the relationship between the gradients of 3 collinear points.
Use the applet below to explore the relationship between the gradients of 3 collinear points.