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πrs = 432,9
3,14x9xs = 432,9
28,26 s = 432,9
s = 432,9/28,26
s=15,3
t² = s²-r²
=15,3²-9²
=234,09-81
=153,09
t =√153,09
t=12,37
lpk = πr(r+s)
= 3,14x9(9+15,3)
=28,26x24,3
=686,7