А,

Mathematics

1 answer:

miss Akunina [59]2 years ago

7 0

Answer:

$\displaystyle 35$

Explanation:

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

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

I am joyous to assist you at any time.

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