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Problem
Problem
In
Δ
A
B
C
\Delta ABC
Δ
A
B
C
, if
2
b
=
a
+
c
2b = a + c
2
b
=
a
+
c
and
A
−
C
=
90
∘
A - C = 90^\circ
A
−
C
=
9
0
∘
, then
sin
B
\sin B
sin
B
equals a.
7
5
\frac{\sqrt{7}}{5}
5
7
b.
5
8
\frac{\sqrt{5}}{8}
8
5
c.
7
4
\frac{\sqrt{7}}{4}
4
7
d.
5
3
\frac{\sqrt{5}}{3}
3
5
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