Co-ordinate Geometry

Question 1

Length /distance

Answer 1

/(X2-X11)^2+ (y2-y1)^2

Question 2

Midpoint

Answer 2

(X1+x2/2) , (y1+y2/2)

Question 3

Gradient

Answer 3

(Y2-y2)/(x2-X1)

Question 4

Parallel lines have the same gradient

Answer 4

Perpendicular lines have opposite gradients

M1xm2=-1

Question 5

What’s the equation of a line

Answer 5

Y=mx+c

y-y1=m(X-X1)

Question 6

What’s another name for a perpendicular line?

Answer 6

The normal