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1540cm^3 = 22/7 x 7cm x 7cm x t
1540cm^3 =154cm^2 x t
t = 1540cm^3/154cm^2
t =10cm
Luas=2 x phi x r ( r +t )
=2 x 22/7 x 7cm (7cm+10cm)
=44cm x 17cm
=748cm^2