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In what quadrant does the angle [tex]\frac{2\pi}{3}[/tex] terminate?

A. IV
B. I
C. III
D. II


Sagot :

Certainly! Let's determine the quadrant where the angle [tex]\(\frac{2 \pi}{3}\)[/tex] terminates.

1. Convert the Angle from Radians to Degrees:
The angle [tex]\(\frac{2 \pi}{3}\)[/tex] is given in radians. To convert it to degrees, we use the conversion factor [tex]\(180^\circ = \pi\)[/tex] radians.
[tex]\[ \frac{2 \pi}{3} \text{ radians} \times \frac{180^\circ}{\pi} = \frac{2 \cdot 180^\circ}{3} = 120^\circ \][/tex]

2. Determine the Quadrant:
The next step is to determine in which quadrant the angle [tex]\(120^\circ\)[/tex] lies. The unit circle is divided into four quadrants:
- Quadrant I: [tex]\(0^\circ \leq \theta < 90^\circ\)[/tex]
- Quadrant II: [tex]\(90^\circ \leq \theta < 180^\circ\)[/tex]
- Quadrant III: [tex]\(180^\circ \leq \theta < 270^\circ\)[/tex]
- Quadrant IV: [tex]\(270^\circ \leq \theta < 360^\circ\)[/tex]

Since [tex]\(120^\circ\)[/tex] lies between [tex]\(90^\circ\)[/tex] and [tex]\(180^\circ\)[/tex], it falls in Quadrant II.

So, the angle [tex]\(\frac{2 \pi}{3}\)[/tex] or [tex]\(120^\circ\)[/tex] terminates in Quadrant II.

The correct answer is II.