Question

total surface area of a solid sphere is 154 cm.find the radius .​

Answer 1

Answer:

Radius=3.5 cm

Step-by-step explanation:

Total surface area of Sphere= 154 cm^2

4πr^2= 154

4×22/7×r^2= 154

r^2= 49/4

r= 7/2

r= 3.5 cm

so radius will be 3.5 cm

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Answer 2

$\bold \green{\underline {Step\:by\:step\:explanation:-}}$

$⟹ {Total\:surface \:area\:of\:sphere} = {15\:cm^2}$

$⟹ {4π\:r^2} = {154}$

$⟹ {4×\frac{22}{7}×r^2} = {154}$

$⟹ {r^2} = {\frac{49}{4}}$

$⟹ {R} = {\frac{7}{2}}$

$⟹ \red{R} = \red{3.5\:cm}$