Question

three cubes each of edge 1 metre,6 metre and 8 metre respectively are melted and made into one single cube .find the surface area of a new cube?​

Answer 1

Answer:

volume of first cube=a=1³=1m³

volume of second cube=6³=216m³

volume of third cube=8³=512m³

volume of newly formed cube=1+216+512

=729m³

a³=9³

→a=9

edge of newly formed cube=9m

The Lateral surface area of new cube=4a²

=4(9)²

=4×81

=324m²

The Total surface area of new cube=6a²

=6(9)²

=6×81

=486m²

Hope it works.................................™✌️✌️