Question

find the surface area of a sphere of radius
i 10.5cm ii 5.6cm iii 14 cm​

Answer 1

Step-by-step explanation:

=10.5cm

SA=4πr

2

=4×

7

22

×

10

10.5

×

10

10.5

=

100

88×15×105

=1386 cm

2

(ii) r=5.6cm

SA=4πr

2

=[4×

7

22

×(5.6)

2

]cm

2

=[

7

88

×

10

5.6

×

10

5.6

]cm

2

=394.24 cm

2

(iii) r=14cm,

SA=4πr

2

=4×

7

22

×14×14

=2464 cm

2