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s = 20
luas selimut = luas juring
π R s = 288/360 x π x s²
R= 4/5 S = 4/5 (20)= 16
t = √s²- r²= √20²-16² = 12
V = ¹/₃ π R t = ¹/₃ (3,14)(16)(12) = 200.96