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Uri Lukach · Answer 1 · 2023-03-05T09:25:34+0000

From the angle property of triangle :

The sum of all angles in the triangle are equal to 180 degrees.

In the given triangle DEF

$\begin{gathered} \angle DEF+\angle DFE+\angle FDE=180 \\ \text{ Substitute the value of given angle:}\angle DFE=30,\text{ }\angle FDE=47 \\ \angle DEF+30+47=180 \\ \angle DEF+77=180 \\ \angle DEF=180-77 \\ \angle DEF=103^o \end{gathered}$

The value of

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