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e) r = 3√3 z własności trójkąta 30, 60, 90 stopni
h = 3
V = (π x (3√3)² x 3) :3 = 81π : 3 = 27π
f) r² = 7² - 2² = 45
r = √45 = 3√5
V = (π x (3√5)² x 2) :3 = 90π : 3 = 30π