Radians, arc length and sector area

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Learn it A full turn is 360° = 2π radians, so 180° = π. To convert, multiply degrees by π/180. With θ in radians, arc length s = rθ and sector area A = ½r²θ.

Example: Arc length on a circle of radius 6 cm, θ = 2π/3.

s = rθ = 6 × 2π/3
= 4π ≈ 12.6 cm.

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