The Gold Coin

A coin is cylindrical

Hence, $Volume\quad Of\quad A\quad Cylinder=\pi { \times Radius }^{ 2 }\times Height$

Radius = 0.7cm i.e. 7 mm Height = 2 mm

$Volume\quad Of\quad Coin=\frac { 22 }{ 7 } \times 7\times 7\times 2=308{ mm }^{ 3 }$

Hence Volume Of 10 Coins = $308\times 10=3080{ mm }^{ 3 }$