Question

The needle of watch is 21cm long. Find thebarea covered by it in 10 minutes?​

Answer 1

Answer:

so radius=2cm

angle =(360°/60°)×20=120°(as each minute makes an angle of360/60)

now using formul

120/360×22/7×21

66cm

Answer 2

Answer:

231 cm² is the correct answer.

Step-by-step explanation:

Angle formed by the needle of watch in 60 minutes = 360°

Angle formed by the needle of watch in 1 minute      = 360°/60

                                                                                       = 6°

Angle formed by the needle of watch in 10 minutes  = 10 × 6°

                                                                                       = 60°

Area covered by the needle of watch by rotating 360° = π × r²

                                                                                           = 22/7 × (21)²

                                                                                           = 1386 cm²

Area covered by the needle on rotating through 60°    = 1386 × 60° × $\frac{1}{360}$

                                                                                           = 231 cm²

                                        ANSWER → 231 cm²  

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