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1/3πr²t = 4.312
1/3x3,14xr²x28= 4.312
29,3 r² = 4.312
r² = 4.312/29,3
r²=147,16
r=12,13
lpt =2πr(r+t)
= 2x3,14x12,13(12,13+28)
=76,17x40,13
=3056,7