Ответ:
Пошаговое объяснение:
2R = 3r => R = (3/2)r
π(R²-r²) = 20π
(9/4)r² - r² = 20
(5/4)r² = 20
r² = 20:(5/4) = 20 * 4/5 = 16
Sмал = πr² = 16π
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Ответ:
Пошаговое объяснение:
2R = 3r => R = (3/2)r
π(R²-r²) = 20π
(9/4)r² - r² = 20
(5/4)r² = 20
r² = 20:(5/4) = 20 * 4/5 = 16
Sмал = πr² = 16π