Question

if a cylindrical bar has a radius 2m and height 9m and it it is melted and become a sphere , what is the radius of sphere?

Answer 1

Answer:  Radius = r =  64.63 cm

Answer 2

r=2m (for cylinder)

h=9m (for cylinder)

r'= (sphere radius)

volume of = volume of

cylinder sphere

πr^2h = 4/3πr^3

r^2h = 4/3 r^3 (cancel π from both side)

2^2×9= 4/3 r^3 (substitute value of r and h)

4×9×3/4= r^3

27 = r^3

r =3m. ( 3^3=27)