ra đi an

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The Vietnamese word "ra đi an" (in mathematics) translates to "radian" in English. A radian is a unit of angular measurement used in mathematics, particularly in trigonometry and geometry.

Explanation:

• Basic Definition: A radian is the angle created when you take the radius of a circle and stretch it along the circumference. In simpler terms, if you take the radius of a circle and lay it out along the circle's edge, the angle you get at the center of the circle is one radian.

Usage Instructions:

• When to Use: You would use "ra đi an" when discussing angles in mathematics, particularly when dealing with circles, trigonometric functions, or geometry.

Example:

• In a math problem, you might say: "Một vòng tròn có 2π ra đi an" (A circle has 2π radians).

Advanced Usage:

• In advanced mathematics, understanding the conversion between degrees and radians is important. For example, 180 degrees is equal to π radians. This is useful in calculus, physics, and engineering applications.

Word Variants:

• Degrees: While "ra đi an" refers specifically to radians, "độ" is the Vietnamese word for degrees, another unit of measuring angles.
• Trigonometric Functions: When working with functions like sin, cos, and tan, they can be expressed in terms of radians or degrees.

Different Meanings:

• In a mathematical context, "ra đi an" specifically refers to the radian as a unit of measure for angles. It does not have other meanings outside of mathematics in Vietnamese.

Synonyms:

• There are no direct synonyms for "ra đi an" in Vietnamese, as it specifically refers to the radian. However, you might encounter phrases referring to "đơn vị đo góc" (unit of angle) when discussing angular measurements more generally.

Summary:

"Ra đi an" is an essential term in mathematics that describes a unit of measure for angles.

Academic

1. (toán học) Radian