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Butoxors [25]
3 years ago
13

А,

Mathematics
1 answer:
Alexeev081 [22]3 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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