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Find in terms of x the length of the arc that subtends an angle of 30°, at the centre of circle of radius 4 cm.

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Length of arc = (θ/360°)x2πr

Radius = r = 4 cm

θ = angle subtended at centre = 30°

Arc length = 30°/360°x2x(7)

= 2π/3 cm

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