The figure shows a circle with center
P
, a diameter
¯¯¯¯¯¯
B
D
, and inscribed
△
B
C
D
.
P
C

=

10
.
Let
m
∠
C
B
D
=
(
x
)
°
and
m
∠
B
C
D
=
(
x
+
54
)
°
.