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panjang=9cm
jb:
k=2(p+l)
57=2(9+l)
57=18+2l
2l=57-18
2l=39
l=19,5
Luas=p.l
=9.19,5
=175,5cm
:)
p = 9cm
K = 2p + 2l
57= 18 + 2l
2l = 57 - 18
2l = 39
l = 19,5
L = p x l
= 9 x 19,5
= 175,5