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Mathematics
Problem
For
△
D
E
F
\triangle DEF
△
D
E
F
with vertices
D
(
−
3
,
2
)
D(-3,2)
D
(
−
3
,
2
)
,
E
(
1
,
5
)
E(1,5)
E
(
1
,
5
)
and
F
(
4
,
−
1
)
F(4,-1)
F
(
4
,
−
1
)
, find its semi-perimeter (half the perimeter). Leave the answer in simplest radical form.
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