o
r
d
e
r
e
d
c
o
e
f
f
i
c
i
e
n
t
s
a
7
3
7
.
5
a
6
3
2
.
5
a
5
2
7
.
5
a
4
2
2
.
5
a
3
1
7
.
5
a
2
1
2
.
5
a
1
7
.
5
a
0
2
.
5
3
7
.
5
7
z
+
3
2
.
5
6
z
+
2
7
.
5
5
z
+
2
2
.
5
4
z
+
1
7
.
5
3
z
+
1
2
.
5
2
z
+
7
.
5
z
+
2
.
5
r
i
n
g
a
r
e
a
:
A
R
=
3
.
4
8
0
5
4
π
u
n
i
t
c
i
r
c
l
e
a
r
e
a
:
A
C
=
π