Sсферы = 4πR² = 19π ⇒ 4R² = 19 ⇒ R = √19 / 2
Vшара = 4/3 πR³ = 4/3 · π · (√19 / 2)³ = 4/3 · π · 19√19 / 8 = 19√19 / 6 · π
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Sсферы = 4πR² = 19π ⇒ 4R² = 19 ⇒ R = √19 / 2
Vшара = 4/3 πR³ = 4/3 · π · (√19 / 2)³ = 4/3 · π · 19√19 / 8 = 19√19 / 6 · π