Question

An iron spear is of diameter 42 cm what is the volume of spear?

Answer 1

VOLUME=4/3 πR^3

as diameter=2 radius
radius=d/2

r=42/2
r=21cm=21×10^-2

volume=4/3. π×21×21×21×10^-6

volume=0.038772

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Answer 2

Hi,

Here is your answer !
______________________________

Given that ,

Diameter of iron sphere = 42 cm

∴ Radius of iron sphere,

r = D/2 = 42/2 = 21 cm

→ r = 21 cm

Now,
We know that

Voume of sphere, V = 4/3 πr³

→ V = 4/3 × 22/7 × 21 × 21 × 21

→ V = [ (4×22) / 21 ] × 21 × 21 × 21

→ V = 88 × 21 × 21

→ V = 38808 cm³

Hence,

Volume of given sphere is 38808 cm³