Question

Find the surface area of a sphere with radius 23 cm

Answer 1

$Radius \: of \:the \:Sphere (r) = 23 \:cm$

$\boxed { \pink { Surface \:Area \:of \:a \:Sphere(A) = 4 \pi r^{2}}}$

$\implies A = 4 \times \frac{22}{7} \times 23^{2} \\= 4 \times \frac{22}{7} \times 23\times 23 \\= \frac{46562}{7} \\= 6650.28 \: square \:cm$

Therefore.,

$\red{ Surface \:Area \:of \:a \:Sphere(A)}$

$\green { = 6650.28 \: square \:cm}$

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Answer 2

$\bf \red{given}$

• radius=23 cm

$\bf \red{to \: find \: out}$

• the surface area of a sphere

$\bf \red{formula \: used}$

$surface \: area \: of \: sphere = 4\pi\ r {}^{2}$

$\bf \red{solution}$

$area = \pink{ 4 \times \frac{22}{7} \times 23 {}^{2} }$

$area = \purple {\frac{46562}{7} }$

$area = \blue{6650.28 }$cm²

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Find volume and surface area of sphere with radius 4.2cm

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