Question

9. A tunnel was constructed for the metro-railway and any cross-section of the inside tunne
is a semi-circle with a diameter measuring 8 m. If the cost of painting the inner cu
surface of the tunnel is 69080 at the rate of 7 220 per mº, find the length of the tunnel
(take π = 3.14)
​

Answer 1

Answer:81.45m

Step-by-step explanation:

Answer 2

Answer:

81.45 m²

Explanation:

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