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Difficulty: 2/102024 NMTC 2024 (QII-22)

Let the central angle subtended by two points on circle is 120°. Then the inscribed angle subtended by those points is ________.

Guide / Hint

Hint 1: Recall the relationship between the central angle and the inscribed angle subtending the same arc.

Hint 2: The inscribed angle is always half of the central angle.

Hint 3: Divide by 2 to get the final answer.

Solution

Step 1 (Inscribed Angle Theorem): The Inscribed Angle Theorem states that the angle subtended by an arc at any point on the circle (the inscribed angle) is exactly half of the angle subtended by the same arc at the center of the circle (the central angle).

Step 2 (Direct Calculation): We are given that the central angle is . Using the theorem:

Step 3 (Conclusion): The inscribed angle is exactly . The numeric value is 60.

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    2024 NMTC 2024 QII-22 - Olympiad Math Olympiad Question | Leminno