1
Q
distance formula
A
2
Q
midpoint formula
A
3
Q
eqn of a straight line
A
y=mx +c
y-y1=m(x-x1)
4
Q
parralel lines
A
m1=m2
5
Q
perpendicular lines
A
m1*m2=-1
6
Q
eqn of a circle
A
7
Q
centre
A
a,b
8
Q
radius
A
r
9
Q
general form
A
10
Q
centre
A
11
Q
radius
A
12
Q
tangents of a circle is always
A
perpendicular to the radius
9709
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