Given; volume = 48 π cubic cm, h = 9 cm, r = ?
Volume of cone = 1/3 π r² h
Or, 48 π = 1/3 π r² X 9
Or, r² = 48/3 = 16
Or, r = 4 cm

Given; r = 3.5 m, h = 12 m
Volume of cone = 1/3 π r² h
= (1/3) X (22/7) X (3.5)² X 12 = 154 cubic cm
= 154 kilo litre

Given; volume = 9856 cubic cm, d = 28 cm so, r = 14 cm
Volume of cone = 1/3 π r² h
Or, 9856 = (1/3) X (22/7) X 14² X h
Or, h = (9856 X 3 X 7)/(22 X 196) = 48 cm

Slant Height:
Here; l² = h² + r²
= 48² + 14² = 2500
Or, l = 50 cm

Curved surface area of cone = π rl
= (22/7) X 14 X 50 = 2200 sq cm

Given; h = 12 cm, r = 5 cm
Volume of cone = 1/3 π r² h
= (1/3) π X 5² X 12 = 100 π cubic cm

Given; h = 5 cm, r = 12 cm
Volume of cone = 1/3 π r² h
= (1/3) π X 12² X 5 = 240 π cubic cm

Ratio = 100/240 = 5 : 12

Given; r = 5.25 m, h = 3 m
Volume of cone = 1/3 π r²h
= (1/3) X (22/7) X (5.25) X 3

= 50.625 cubic m

(i) 7 cm

Solution: Volume of sphere = 4/3 π r²
= (4/3) X (22/7) X 7³ = 1437.33 cubic cm

(ii) 0.63 m

Solution: Volume of sphere = 4/3 π r³
= (4/3) X (22/7) X (0.63)³ = 1.047 cubic m

(i) 28 cm

Solution: Volume of sphere = 4/3 π r³
= (4/3) X (22/7) X 28³ = 91989.33 cubic cm

(ii) 0.21 m

Solution: Volume of sphere = 4/3 π r³
= (4/3) X (22/7) X (0.21)³ = 0.38808 cubic m