Q. 175.0( 1 Vote )

Mathematics teach

Answer :

i. Cloth material required = 2 × S A of hemispherical dome


= 2 × 2π r2


= 2 × 2 × × (2.5)2 m2


= 78.57 m2


ii. Volume of a cylindrical pillar = π r2h


iii. Lateral surface area = 2 × 2πrh


= 4 × x 1.4 x 7 m2


= 123.2 m2


iv. Volume of hemisphere = π r3


= (3.5)3 m3


= 89.83 m3


v. Sum of the volumes of two hemispheres of radius 1 cm each


= 2 × π13


Volume of sphere of radius 2cm = 4/3 π 23


So, required ratio = = 1 : 8


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