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(Please enable graphics (picture) options to view the formulae since some of the formulae are in gif format)
Circles
The
equation of a circle with cente ( a , b ) and radius ' r ' is given
by
.
is
the equation of a circle with cente ( - g , - f ) and radius
represents a circle in which
and
are the endpoints of a diameter of the circle.
If P is the point of contact of a tangent to a circle with centre C and radius r then CP is perpendicular to the tangent and CP = r.
is the equation of the tangent at
on
the circle
The
circles
and
cut orthoganally
if
Other Analytical Geometry pages
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