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Answer:
Area covered in 30 min = 19.25
Step-by-step explanation:
Given:
Radii = 3.5cm
Time = 30min
pi = 22/7
So:
Area covered by the hand in 60 min = circle with radii of length minute hand
Area covered by the hand in 60 min = 22/7 x 3.5^2
Area covered by the hand in 60 min = 22/7 x 12.25
Area covered by the hand in 60 min = 22 x 1.75
Area covered by the hand in 60 min = 38.5
Therefore area covered by hand in 30 minutes = 1/2 area of total circle ( 30 min= 1/2 x 60 min).
Area covered in 30 min = 1/2 x 38.5
Area covered in 30 min = 19.25