Question

the volume of a cube is 729 cm.find it's surface area and the length of a diagonal.

Answer 1

hello users ......

we have given that :
volume of a cube is 729 cm³

we have to find :-
surface area and the length of a diagonal  = ? 

solution :-
we know that :
volume of cube = a³
surface area of cube = 6a² 
and 
length of diagonal = a√3

here,
 a³ = 729 cm³ 
=> a³ = 9³ cm³  
=> a = 9 cm

now 
surface area = 6 a² = 6×9² 
= 6 × 81 = 486 cm²

and 
length of diagonal =a √3  = 9 ×√3 cm 

✰✰ hope it helps ✰✰

Answer 2

hope it helps uhh ✌....✌