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Mathematics
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
, if
A
B
=
A
C
AB = AC
A
B
=
A
C
, which relation among the angles of the triangle is always true? a)
∠
A
=
∠
B
\angle A = \angle B
∠
A
=
∠
B
b)
∠
A
+
∠
B
=
90
∘
\angle A + \angle B = 90^{\circ}
∠
A
+
∠
B
=
9
0
∘
c)
∠
B
=
∠
C
\angle B = \angle C
∠
B
=
∠
C
d)
∠
A
=
∠
B
=
∠
C
\angle A = \angle B = \angle C
∠
A
=
∠
B
=
∠
C
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