Russian Translation(s) & Details for 'Circumference'

English Word: Circumference

Key Russian Translations:

• окружность [ɐˈkruʐnəsʲtʲ] - [Formal, Used in geometry or general contexts]
• длина окружности [ˈdlʲinə ɐˈkruʐnəsʲtʲi] - [Formal, Specifically for the measurement of circumference]

Frequency: Medium (Common in academic or technical contexts)

Difficulty: B1 (Intermediate) for "окружность"; B2 (Upper-Intermediate) for "длина окружности"

Pronunciation (Russian):

окружность: [ɐˈkruʐnəsʲtʲ]

Note on окружность: Stress falls on the second syllable. The "ж" sound is a voiced retroflex fricative, which may be challenging for English speakers.

длина окружности: [ˈdlʲinə ɐˈkruʐnəsʲtʲi]

Note on длина окружности: Stress is on the first syllable of "длина" and the second syllable of "окружности".

Audio: []

Meanings and Usage:

1. Geometric Boundary (the line enclosing a circle):

Translation(s) & Context:

• окружность - Used to refer to the circular boundary or perimeter in geometry or general descriptions.

Usage Examples:

• Окружность круга нарисована идеально.

  The circumference of the circle is drawn perfectly.

• Мы измерили окружность этого кольца.

  We measured the circumference of this ring.

2. Measurement of the Boundary (the length of the circumference):

Translation(s) & Context:

• длина окружности - Specifically refers to the measurable length of a circle's perimeter, often in mathematical contexts.

Usage Examples:

• Длина окружности рассчитывается по формуле 2πr.

  The circumference (length) is calculated using the formula 2πr.

• Учитель объяснил, как найти длину окружности.

  The teacher explained how to find the circumference.

• Длина окружности этой планеты огромна.

  The circumference of this planet is enormous.

Russian Forms/Inflections:

окружность (feminine noun, 3rd declension):

длина окружности (compound phrase): "длина" (feminine noun) declines similarly to "окружность", while "окружности" is the genitive form of "окружность" and remains fixed in this phrase.

Russian Synonyms/Antonyms:

Synonyms for "окружность":

• контур (outline, contour - more general)
• периметр (perimeter - often used for polygons)

Antonyms for "окружность":

• центр (center)
• радиус (radius)

Related Phrases:

• измерить окружность - to measure the circumference
• длина окружности круга - the circumference of a circle (length)
• окружность Земли - the circumference of the Earth

Usage Notes:

• "окружность" is the general term for the concept of a circle's boundary and can be used in both everyday and technical contexts.
• "длина окружности" explicitly refers to the measurable length and is more common in mathematical or scientific discussions. Use this when emphasizing the numerical value.
• Be mindful of the context: in casual speech, "окружность" might suffice even when referring to length, but precision is appreciated in formal settings.

Common Errors:

• Error: Using "круг" (circle) instead of "окружность" to refer to the boundary. "Круг" refers to the entire shape, not just the perimeter.
  Incorrect: Длина круга равна 10 см.
  Correct: Длина окружности равна 10 см.
• Error: Omitting "длина" when precision is needed in technical contexts.
  Incorrect: Окружность равна 10 см.
  Correct: Длина окружности равна 10 см.

Cultural Notes:

In Russian educational contexts, especially in geometry classes, "окружность" and "длина окружности" are fundamental terms introduced early on. They are often associated with classical mathematical formulas like 2πr, reflecting the emphasis on precision in Russian STEM education.

Related Concepts:

• радиус (radius)
• диаметр (diameter)
• площадь круга (area of a circle)