area is onedauch aeol rod which is 25 em long and of 20 em in diameter

1.	area is onedauch aeol rod which is 25 em long and of 20 em in diameter is melted to form adiameter. Find the length of the new rod.
Answer» volume of rod =πr^2hvolume of 1st rod = π(20/2)^2 ×25 = π×2500 Radius = 20, height = 25 cmvolume of 2nd rod = π(19/2)^2×h = π×9.5^2× h Radius = 19, h not known π×2500= π×9.5^2×hh = 2500/(9.5^2) = 27.70 cm thanks

area is onedauch aeol rod which is 25 em long and of 20 em in diameter is melted to form adiameter. Find the length of the new rod.

Answer»

volume of rod =πr^2hvolume of 1st rod = π(20/2)^2 ×25 = π×2500

Radius = 20, height = 25 cmvolume of 2nd rod = π(19/2)^2×h = π×9.5^2× h Radius = 19, h not known

π×2500= π×9.5^2×hh = 2500/(9.5^2) = 27.70 cm

thanks