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r²=13²-12²
r²=169-144
r²= 25
r = 5
Ls = phi x r (r + s)
= 3,14 x 5 ( 5+13)
= 3,14 x 5 x 18
r= akar 169-144
r=akar 25
r= 5
lp= 3.14 × 5 (5+13)
= 3.14×5 × 18
= 282.6