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What is arc length?
a fraction of the circle’s circumference
What is sector area?
area of a ‘slice’ of the circle
How to calculate arc length if θ is in degrees?
θ/360 ×2πr
How to calculate arc length if θ is in radians?
θ*r
What is sector area formed by?
a central angle (θ)
How to calculate sector area if θ is in degrees?
θ/360 *πr2
How to calculate sector area if θ is in radians?
½* θ*r2
Note 
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