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Mathematics
Mathematics
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
,
D
D
D
and
E
E
E
are the midpoints of
A
B
AB
A
B
and
A
C
AC
A
C
respectively. The side lengths of
△
A
B
C
\triangle ABC
△
A
B
C
are
A
B
=
14.4
cm
AB = 14.4\,\text{cm}
A
B
=
14.4
cm
,
A
C
=
11.8
cm
AC = 11.8\,\text{cm}
A
C
=
11.8
cm
and
B
C
=
17.6
cm
BC = 17.6\,\text{cm}
B
C
=
17.6
cm
. a. (i) Find the length of
D
E
DE
D
E
. b. (ii) Calculate the perimeter of
△
A
D
E
\triangle ADE
△
A
D
E
.
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