WOLFRAM
|
DEMONSTRATIONS PROJECT
A
r
c
L
e
n
g
t
h
o
f
a
L
o
g
a
r
i
t
h
m
i
c
S
p
i
r
a
l
c
1
a
0
.
2
t
-
2
2
.
9
z
o
o
m
3
0
0
s
h
o
w
l
a
b
e
l
s
T
h
e
a
r
c
l
e
n
g
t
h
o
f
t
h
e
l
o
g
a
r
i
t
h
m
i
c
s
p
i
r
a
l
r
=
c
a
θ
e
f
o
r
θ
r
u
n
n
i
n
g
f
r
o
m
-
∞
t
o
t
e
q
u
a
l
s
t
h
e
l
e
n
g
t
h
o
f
t
h
e
t
a
n
g
e
n
t
P
T
.