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Vkerucut = 1/3 π r² t
4158 = 1/3 3,14 (10,5)² t
4158 = 115,395 t
36,03 = t
36 = t
s² = t² + r²
s² = 36² + 10,5²
s² = 1406,25
s² = 1406
s² = 1406
s = 37
Lpermukaan = π r (r + s)
= 3,14 10,5 (10,5 + 37)
= 32,97 (47,5)
= 1.566