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πr²=9π
r = 3
V = (4/3)π * 3³
V = (4/3)π * 27
V = 36π
P = 4π*3²
P = 36π
b)Objętość kuli jest równa π/6 dm³.Oblicz pole powierzchni tej kuli.
π/6 = (4/3)πr³
(1/6) = (4/3)r³
(1/6)*(3/4) = r³
r = ³√(3/24)
r = ³√(1/8)
r = ½ dm
P = 4πr²
P = 4π(½)²
P = π dm²
r² = 9 |√
r=3
V = ⁴/₃π * 3³
V = ⁴/₃π * 27
V = 36π
P = 4π*3²
P=4π*9
P = 36π
b)π/6 = ⁴/₃πr³ |/π
¹/₆ = ⁴/₃r³
¹/₆*³/₄ = r³
r³=³/₂₄
r = ³√ ³/₂₄
r = ³√ ¹/₈
r = ½ [dm]
P = 4π*(½)²
P=4π*¼
P = π [dm²]