1 Answer

Knut Holm · Answer 1 · 2023-10-11T15:58:49+0000

Answer:

$\displaystyle 35$

Step-by-step explanation:

Complementary Angles sum up to ninety degrees, so do the following:

$\displaystyle 90° = 55° + m\angle{DEF} \\ \\ 35° = m\angle{DEF}$

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