Practice Set 9.3 Geometry 9th Std Maths Part 2 Answers Chapter 9 Surface Area and Volume
ii. Given: Radius (r) = 9 cm
To find: Surface area and volume of sphere
Solution:
Surface area of sphere = 4πr2
= 4 x 3.14 x 92
∴ Surface area of sphere = 1017.36 sq.cm
∴ Volume of sphere = 3052.08 cubic cm
iii. Given: Radius (r) = 3.5 cm
To find: Surface area and volume of sphere
Solution:
Surface area of sphere = 4πr2
= 4 x 3.14 x (3.5)2
∴ Surface area of sphere = 153.86 sq.cm
Volume of sphere = πr3
= x 3.14 x (3.5)3
∴ Volume of sphere = 179.50 cubic cm
ii. Total surface area of hemisphere = 3πr2
= 3 x 3.14 x 52
= 235.5 sq.cm.
∴ The curved surface area and totai surface area of hemisphere are 157 sq.cm, and 235.5 sq.cm, respectively.
ii. Volume of sphere = πr3
= x 3.14 x 153
= x 3.14 x 15 x 15 x 15
= 4 x 3.14 x 5 x 15 x 15
= 14130 cubic cm.
∴ The volume of the sphere is 14130 cubic cm.
ii. Diameter = 2r
= 2 x 30 = 60 cm
∴ The diameter of the hemisphere is 60 cm.
Maharashtra Board Class 9 Maths Solutions