Question

find find the surface area of a sphere of radius 10.5 CM ​

Answer 1

Step-by-step explanation:

Ex 13.4, 1 Assume π = 22/7, unless stated otherwise. Find the surface area of a sphere of radius: 10.5 cm Radius of sphere = r .

Answer 2

To Find

• Surface area of Sphere

Solution :

• Radius of sphere = 10.5cm

${\underline{\boxed{\star\bf \: Surface \:area \:of \:sphere = 4 \pi {r}^{2} }}}$

= 4 × π × 10.5²

= 4π × 110.25

= 441π

OR

= 441 × 22/7

= 63 × 22

• = 1,386 cm²

Hence,

• Surface area of sphere is 1386cm²

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