s
i
n
(
A
)
=
0
.
8
9
4
4
3
s
i
n
(
B
)
=
0
.
8
9
4
4
3
s
i
n
(
C
)
=
0
.
8
0
0
0
0
α
=
4
.
4
7
2
1
4
β
=
4
.
4
7
2
1
4
γ
=
4
.
0
0
0
0
0
r
a
t
i
o
:
0
.
2
0
0
0
0
0
.
2
0
0
0
0
0
.
2
0
0
0
0