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d=10===>r=5
s=12
t tabung = 8
Dit : L permukaan =?
Jawab:
L selimut kerucut = πrs = π5*12 = 60π
L selimut tabung = 2πrt = 2π5*8 = 80π
L alas = πr² = π5² = 25π
L permukaan = 60π + 80π + 25π =165π