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Mathematics
Problem
In
△
P
Q
R
\triangle PQR
△
P
QR
, if
P
Q
=
P
R
PQ = PR
P
Q
=
P
R
, which statement must be true? a)
∠
Q
+
∠
R
=
90
∘
\angle Q + \angle R = 90^{\circ}
∠
Q
+
∠
R
=
9
0
∘
b)
∠
P
=
∠
Q
\angle P = \angle Q
∠
P
=
∠
Q
c)
∠
Q
=
∠
R
\angle Q = \angle R
∠
Q
=
∠
R
d)
∠
Q
+
∠
R
=
∠
P
\angle Q + \angle R = \angle P
∠
Q
+
∠
R
=
∠
P
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