Answer :
Internal radius of a hollow hemispherical vessel (r1) = 21 cm
External radius of a hollow hemispherical vessel (r2) = 22.75 cm
Capacity of a hollow hemispherical vessel =
π r13 = × 
× 21 × 21 × 21
= 19404 cm3
= 19.404 litres
Curved surface area of a hollow hemispherical vessel = 2π r22
= 2× (22.75 ) 2
= 3253.25 cm3.
External radius of a hollow hemispherical vessel (r2) = 22.75 cm
Capacity of a hollow hemispherical vessel =
π r13 = × × 21 × 21 × 21 = 19404 cm3
= 19.404 litres
Curved surface area of a hollow hemispherical vessel = 2π r22
= 2×
(22.75 ) 2= 3253.25 cm3.
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