Per NCERT, what is the length of an arc of a circle of radius r that subtends an angle of θ degrees at the centre?
A2πr × (θ/360°)
Bπr × (θ/180°)²
C2πr/θ
D2πr × (360°/θ)
Answer & Solution
Correct answer: A. 2πr × (θ/360°)
Arc length = (θ/360°) × full circumference (per NCERT's generalisation from semicircle / quarter-circle cases). The other options misstate.
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