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There need not be any water in it - it could be empty!
The volume is 15 metres3.
this is exatcly right 100 cm = 1 meter if that's what u mean by mtr
1 mtr = 100 cm
2.54 cm = 1 inch
12 inch = 1 ft.
so, 1 mtr = 100/2.54 inch = 100/(2.54*12) ft.
1 mtr = 3.28 ft.
so 1 sq. mtr = (3.28) ^ 2 sq. ft.
= 10.76 sq. ft.
10 in a decimetre
1 metre = 1.0936 var (yards).