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Plz explain q22 in detail, and if you could the fastest way to do it.

Plz explain q22 in detail, and if you could the fastest way to do it.-example-1
User MinuteMed
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Answer:

Hello,

Explanation:

30°=π/6 (rad)


L=\theta*R=(\pi)/(6) *120\\\\=20*\pi\\\\\approx{20*3=60\ (cm)}

User Baoky Chen
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