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Fig. 15.87, shows the cross-section of ...

Fig. 15.87, shows the cross-section of railway tunnel. The radius `O A` of the circular part is 2 m. If `/_A O B=90o` , calculate: (i) the height of the tunnel (ii) the perimeter of the cross-section (iii) the area of the cross-section.

A

76

B

75

C

74

D

73

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