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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
, chords
M
N
MN
M
N
and
P
R
PR
P
R
are equal in length. If
∠
M
O
N
=
80
∘
\angle MON = 80^{\circ}
∠
M
O
N
=
8
0
∘
, find
∠
P
O
R
\angle POR
∠
P
O
R
.
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