amanda7835
06.02.2021 •
Mathematics
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Answers on questions: Mathematics
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Ответ:
1. SA = 216π cm² ≈ 678.24cm²
2. SA = 360π ft²≈ 1130.40ft²
3. SA = 156π yd² ≈ 489.84yd²
4. SA = 576π m² ≈ 1808.64 m²
Step-by-step explanation:
SA of a cylinder = 2πrh + 2πr²
1. r = diameter ÷ 2
r = 12/2 = 6
SA = 2π(6)(12) + 2π(6)²
SA = 144π + 72π
SA = 216π ≈ 678.24
2. r = 19/2 = 9
SA = 2π(9)(11) + 2π(9)²
SA = 198π + 162π
SA = 360π ≈ 1130.40
3. SA = 2π(6)(7) + 2π(6)²
SA = 84π + 72π
SA = 156π ≈ 489.84
4. r = 24/2 = 12
SA = 2π(12)(12) + 2π(12)²
SA = 288π + 288π
SA = 576π ≈ 1808.64
Ответ: