Question

. Find the surface area of a sphere of radius: (1) 10.5 cm (ii) 5.6 cm 2.
Find the surface area of a sphere of diameter: (1) 14 cm (ii) 21 cm
solution please​

Answer 1

$r_{1} = 10.5cm$

$r_{2} = 5.6cm$

$r_{3} = \frac{d}{2} = \frac{14}{2} = 7cm$

$r_{4} = \frac{ d_{1}}{2} = \frac{21}{2} = 10.5cm$

$r_{1} = r_{4}$

$surface \: area \: of \: circle_{1} \: and \: circle_{4} = 4 \times \pi \times {r}^{2}$

$= 1385.44 {cm}^{2}$

$surface \: area \: of \: circle_{2} = 394.08 {cm}^{2}$

$surface \: area \: of \: circle_{3} = 615.75 {cm}^{2}$

Answer 2

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