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The adjoining figure shows the cross-section of a railway tunnel.
The radius of the tunnel is 3.5m (i.e., OA=3.5m) and ∠AOB=90o. Calculate :
i. the height of the tunnel.
ii. the perimeter of its cross section, including base.
iii. the area of the cross-section
iv. the internal surface area of the tunnel, excluding base, if its length is 50m.
(Ans: (i) 5.97m (ii) 21.44m (iii) 28.875 sq m (iv) 825 sq m)
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