Question

Find the radius of a sphere whose surface area is 154 cm²

Answer 1

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Answer 2

REQUIRED ANSWER : -

GIVEN - surface area of sphere $= 154 \: cm {}^{2}$

Find - surface area of a sphere

SOLUTION,

S A of sphere $= 4\pi \: r {}^{2}$

➠ $4\pi \: r {}^{2} = 154$

➠ $4 \times \frac{22}{7} \times \pi \: r = 154$

➠ $r {}^{2} = \frac{154 \times 7}{4 \times 22} = 12.25$

➠ $\pi = \: \sqrt{12.25} = 3.5$

hence, proved

★ ADDITIONAL INFORMATION

Formula used be area of sphere

$= 4\pi r {</strong></p><p><strong>[tex] = 4\pi r {}^{2}$