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= 1,177,5 / 3.14 . 15
= 1,177.5 . 47,1
(s) = 25
b) LPK : 3.14 . 15 ( 15 + 25 )
: 1,884 cm (persegi)
1177,5 = 3,14 ×15 × s
1177,5 = 47,1 × s
s = 1177,5 ÷ 47,1
s = 25
Lp = phi x r ( r + s )
= 3,14 × 15 ( 15 + 25 )
= 1884