Question

find the the number of small iron spheres of radius 1.75 cm which are making from melting big iron sphere of radius 3.5cm
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Answer 1

Step-by-step explanation:

we assume n is the number of balls

then we equate both the sides as after melting they will be equal

4/3*pi*(3.5)^3 =n*4/3*pi*(1.75)^3

(3.5/1.75)^3 =n

n=8

Answer 2

Step-by-step explanation:

area of sphere is 4πr^2

so therefore area of small sphere is

=4π×1.75×1.75

=38.48(cm.)^2

similarly,

area of big iron sphere is

=4π×3.5×3.5

=153.94 cm^2

so therefore total number of small sphere is

=153.94/38.48

=4.00051

approximately answer is 4 small sphere can be made from that big sphere.