Question

The curved surface area of a sphere is 361cm^2.find the length of radius of sphere

Answer 1

Answer:

Radius ≈ 5.36 cm

Explanation:

Let the radius of a sphere = r cm

Curved surface area= 361cm²

=> 4πr² = 361

=> 4×(22/7)×r² =361

=> r² = (361×7)/(4×22)

=> r² = 28.719

=> r = √28.716

=> r ≈ 5.36 cm

••••

Answer 2

$\bf\huge\textbf{\underline{\underline{According\:to\:the\:Question}}}$  

Suppose the radius of a sphere be r  

CSA of Sphere = 361cm²

⇒ 4πr² = 361

$\bf\huge{\implies 4\times\dfrac{22}{7}\times r^2 = 361}$        

$\bf\huge{\implies r^2=\dfrac{361\times 7}{4\times 22}}$  

⇒ r² = 28.719

⇒ r = √28.716

$\bf\huge\bf\huge{\boxed{\bigstar{{r = 5.36}}}}$