There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of_______________?
(A) 1 : 1½ : 2
(B) 2 : 1½ : 1
(C) 1 : 1 : 2
(D) None of these
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