θ =π/3 θ=360−60=300θ =2π−π/3 arc length, b = θ/360 . 2πr =12/3π chord= radius = 7cmarea=½θr2 b = 300 × 2 × 22 × 7 where θ is in radians 360 7=½ × 5/3π × 7 × 7 =362/3cm=128.28cm2 area=½b.r =½ × 362/3 × 7 =1281/3cm2 ≈128.33cm2
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