Answer 1 :

Radiusof a sphere (r) = 14 cm∴Surface area = 4πr^{2} = 4 x x 14 x 14 cm^{2}

= 2464 cm^{3}

Answer 2 :

Answer 3 : Surface area of a sphere = 154 cm^{2}

Answer 4 : Diameter of hollow sphere = 7 m

Answer 5 : Surface area of a sphere = 154 cm^{2}

Answer 6 : Edge of a solid cube = 44 cm∴ Volume = a^{2} =(44)^{2} cm^{2}= 44 × 44 × 44 cm^{3}Diameter of a spherical bullet = 4 cm

Answer 7 : Radius of a sphere (R) = 2r

Answer 8 : Internal diameter of a hollow sphere = 4cm∴ Internal radius = 4/2 = 2 cmSimilarly the outer radius (R) = 8/2 = 4 cm∴ Volume of melted used inhollow sphere

Answer 9 : Radius of a sphere (r) = 5 cm∴ Surface area = 4πr^{2}= 4π x 5 x 5 = 100π cm^{2}Radius of cone (r_{1}) = 4 cm

Answer 10 : Let edge of a cube = aThen its volume = a^{3}∵ A sphere is inscribed inthe cube∴ Diameter of sphere = a

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