– Signs and properties of parallel lines intersected by a secant.
If you are looking for specific answers to check your work, you can find them on reputable educational platforms:
Melnikova's problems often don't provide a picture. Practice drawing a clear diagram first; it often reveals the answer immediately.
ГДЗ по геометрии за 7 класс, решебник и ответы онлайн
Basic theory questions (e.g., "Which statement about vertical angles is true?").
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