Multiple choice

The chord of a circle is equal to its radius. The angle subtended by this chord at the minor arc of the circle is : एक वृत्त की जीवा उसकी त्रिज्या के बराबर है। वृत्त के लघु चाप पर इस जीवा द्वारा अंतरित कोण कितना होगा?

  1. 60o

  2. 120o

  3. 150o

  4. 135o
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C Correct answer
Explanation

When chord = radius r, the triangle formed by two radii and the chord is equilateral (all sides = r). Central angle = 60°. The angle subtended at the minor arc = 180° - 60° = 150° (opposite angles of cyclic quadrilateral sum to 180°).

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