Question

.Find the volume of sphere whose surface area is 154 cm2

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Answer 1

Perimeter of a rectangle = 2×(Length+Breadth)

(i) Length = 16.8 cm

Breadth = 6.2 cm

Perimeter = 2×(Length+Breadth)

= 2×(16.8+6.2) =46 cm

(ii) Length = 2 m 25 cm

=(200+25) cm (1 m = 100 cm )

= 225 cm

Breadth =1 m 50 cm

= (100+50) cm (1 m = 100 cm )

= 150 cm

Perimeter = 2×(Length+Breadth)

= 2×(225+150) =750 cm

(iii) Length = 8 m 5 dm

= (80+5) dm (1 m = 10 dm )

= 85 dm

Breadth = 6 m 8 dm

= (60+8) dm (1 m = 10 dm )

= 68 dm

Perimeter = 2×(Length+Breadth)

= 2×(85+68) =306 dm

Answer 2

Step-by-step explanation:

let the radius of the sphere=r cm

Given

surface area=154cm²

4πr²=154

4×22/7×r²=154

r²=154×7/4×22

r²=12.25

r=√12.25

r=3.5

volume of the sphere=4/3πr³=(4/3×22/7×3.5×3.5×3.5)cm³

=179.67cm³