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Radians

★★☆☆☆Middle School

📖Definition

A radian is the angle where the arc length equals the radius. 360° = 2π radians.

θ_rad = (π)/(180) × θ_deg

Convert degrees to radians

s = rθ

Arc length (θ in radians)

A = (1)/(2)r²θ

Sector area (θ in radians)

예제 1

Convert 90° to radians.

예제 2

Find the arc length with radius 5 and central angle π/3 radians.

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