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e
e
e
e
=
c · d/f
e
=
t
2
/f
e
=
(o
2
-r
2
)/f
f
f
f
f
=
c · d/e
f
=
t
2
/e
f
=
(o
2
-r
2
)/e
c
c
c
c
=
e · f/d
f
=
t
2
/d
c
=
(o
2
-r
2
)/d
d
d
d
d
=
e · f/c
d
=
t
2
/c
d
=
(o
2
-r
2
)/c
t
t
t
t
=
(e · f)
1/2
t
=
(c · d)
1/2
t
=
(o
2
-r
2
)
1/2
o
o
o
r
r
r
Power of an outer point for a circle: Secant, Center, Radius "
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