the length of radius of solid spherical ball is 2.1cm let us write by calculating how much cubic cm iron is there and let us find

2 thoughts on “the length of radius of solid spherical ball is 2.1cm let us write by calculating how much cubic cm iron is there and let us find”

1. Answer:

   There is 38.81 cubic cm iron in the spherical ball.

   The curved surface area of the sphere is 55.44 cm².

   Step-by-step-explanation:

   We have given that,

   Length of radius of spherical ball = 2.1 cm

   We have to find the volume and the curved surface area of the iron ball.

   Now, we know that,

   Volume of sphere = 4 π r³ / 3

   ⇒ Volume of sphere = [ 4 * 22 / 7 * ( 2.1 )³ ] / 3

   ⇒ Volume of sphere = [ 4 * 22 / 7 * 2.1 * 2.1 * 2.1 ] / 3

   ⇒ Volume of sphere = ( 4 * 22 * 0.3 * 2.1 * 2.1 ) / 3

   ⇒ Volume of sphere = 4 * 22 * 2.1 * 2.1 * 0.3 ÷ 3

   ⇒ Volume of sphere = 4 * 22 * 2.1 * 2.1 * 0.1

   ⇒ Volume of sphere = 88 * 4.41 * 0.1

   ⇒ Volume of sphere = 8.8 * 4.41

   ⇒ Volume of sphere = 38.808

   ⇒ Volume of spherical ball = 38.81 cm³

   ∴ There is 38.81 cubic cm iron in the spherical ball.

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   Now, we know that,

   Curved surface area of sphere = 4 π r²

   ⇒ Curved surface area of sphere = 4 * 22 / 7 * ( 2.1 )²

   ⇒ Curved surface area of sphere = 4 * 22 / 7 * 2.1 * 2.1

   ⇒ Curved surface area of sphere = 4 * 22 * 0.3 * 2.1

   ⇒ Curved surface area of sphere = 88 * 0.63

   ⇒ Curved surface area of sphere = 55.44 cm²

   ∴ The curved surface area of the sphere is 55.44 cm².

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2. Answer:

   55.44cm²

   Step-by-step explanation:

   Given:

   The radius of sphere = 2.1cm

   Formula used:

   1. Surface area of sphere = 4×π×r2

   ⇒ Surface area of sphere = 4×π×(2.1)2 = 55.44cm2

   2. Volume of sphere = (4/3)×π×r3

   ⇒ Volume of sphere = (4/3)×π×(2.1)3 = 38.808 cm3

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