Параллельные прямые, их признаки и свойства. Урок 5
На рисунке AB ∥ EF ∥ CD и BE ∥ CF. Если ∠ABC = 63°, то найди, чему равны ∠BCD и ∠DEF.

Ответ:
∠BCD =
°.
∠DEF =
°.
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