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Mathematics
Mathematics
Problem
In triangle DEF,
∠
E
\angle E
∠
E
is
90
∘
90^\circ
9
0
∘
. The sides are
D
E
=
x
cm
DE = x\,\text{cm}
D
E
=
x
cm
,
E
F
=
x
+
2
cm
EF = x+2\,\text{cm}
E
F
=
x
+
2
cm
and
D
F
=
10
cm
DF = 10\,\text{cm}
D
F
=
10
cm
. Find
tan
∠
D
\tan \angle D
tan
∠
D
.
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