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Mathematics
Mathematics
Problem
△
A
B
C
\triangle ABC
△
A
B
C
is an isosceles triangle in which
A
B
=
A
C
AB=AC
A
B
=
A
C
. Side BA is produced to D such that
A
D
=
A
B
AD=AB
A
D
=
A
B
. Show that
△
B
C
D
\triangle BCD
△
B
C
D
is a right angle.
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