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Verified Answer :

V=πr2h
3=π·1.72·3.9
3≈11.80296.
V=11.8

Volume of a cone = π r² h/3

π = 3.14
r = 1.7
h = 3.9

V = 3.14 1.7² 3.9/3
V = 3.14 2.89 1.3
V = 11.79690 or 11.80 cubic unit