Question

Find the radius of the sphere whose surface area is 15cm.
step by step

I'll brainliest the answer ​​

Answer 1

$\huge\tt\colorbox{lime}{Answer}$

Surface area of sphere = 15 cm².

r = ?

Surface area of sphere = 4πr²

15 = 4 × 3.14 × r²

15 = 12.56 × r²

r² = 15 ÷ 12.56

r² = 1.19

r = √1.19

r = 1.09 cm

Answer 2

$\huge{\bold{\underline{\underline{Question:-}}}}$

Find the radius of the sphere whose surface area is 15cm.

$\huge{\bold{\underline{\underline{Solution:-}}}}$

Surface area of sphere = 4πr²

Also, surface area of sphere = 15cm²

A.T.Q.

${4\pi \: r}^{2} = {15cm}^{2}$

$4 \times \frac{22}{7} \times {r}^{2} = 15$

${r}^{2} = \frac{15 \times 7}{22 \times 4}$

${r}^{2} = \frac{105}{88}$

${r}^{2} = 1.19(approx)$

$r = \sqrt{1.19}$

$r = 1.09$

So, Radius of circle is = 1.09 cm(approx)