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Easy: Arc length
A sector with a central angle of θ° is θ/360 of the whole circle. Its arc is that fraction of the circumference: (θ/360) × 2πr. Its area is that fraction of the circle's area: (θ/360) × πr². Simplify the fraction before multiplying and leave π in the answer.
Give exact answers in terms of π.
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Both are a fraction of the whole circle: the central angle over 360°. Arc length = (θ/360) × 2πr and sector area = (θ/360) × πr².
The formulas get simpler: arc length = rθ and sector area = ½r²θ, with θ in radians.
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