Arc Length & Sector Area - SAT

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Geometry & Trigonometry

Circles

SAT

Math

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What is arc length?

a fraction of the circle’s circumference

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What is sector area?

area of a ‘slice’ of the circle

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How to calculate arc length if θ is in degrees?

θ/360 ×2πr

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How to calculate arc length if θ is in radians?

θ*r

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What is sector area formed by?

a central angle (θ)

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How to calculate sector area if θ is in degrees?

θ/360 *πr²

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How to calculate sector area if θ is in radians?

½* θ*r²