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11.088 = 22/7 . r² . 18
11.088 : 18 = 22/7 . r²
616 = 22/7 . r²
616 x 7/22 = r²
196 = r²
√196 = r
14 = r
Diameter = 2r = 2x14 = 28cm
..
2. V = La x t
3850 = ½ . 22 . t∆ x 25
3850:25:11 = t∆
14cm = t∆