Find the reference angle for each angle.
205°

검증된 단계별 안내

Identify the quadrant in which the angle 205° lies. Since 205° is between 180° and 270°, it is in the third quadrant.

Recall that the reference angle is the acute angle formed between the terminal side of the given angle and the x-axis.

For angles in the third quadrant, the reference angle \( \theta_r \) is found by subtracting 180° from the given angle: \( \theta_r = \theta - 180^\circ \).

Substitute the given angle into the formula: \( \theta_r = 205^\circ - 180^\circ \).

Simplify the expression to find the reference angle.

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주요 개념

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Reference Angle Definition

A reference angle is the acute angle formed between the terminal side of a given angle and the nearest x-axis. It is always positive and less than or equal to 90°, used to simplify trigonometric calculations by relating angles to their acute counterparts.

Quadrants and Angle Positioning

Angles in standard position are measured from the positive x-axis counterclockwise. Knowing which quadrant an angle lies in helps determine how to calculate its reference angle, as the reference angle depends on the angle's position relative to the x-axis.

Calculating Reference Angles for Angles Greater than 180°

For angles between 180° and 270° (third quadrant), the reference angle is found by subtracting 180° from the given angle. This method helps convert larger angles into acute angles for easier trigonometric evaluation.

Find the reference angle for each angle.205°