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keliling persegi panjang = 60 cm
2(p+l) = 60
2((a+6)+a) = 60
2(2a+6) = 60
4a+12 = 60
4a = 60 - 12
4a = 48
a = 48/4
a = 12
panjang = a + 6 = 12 + 6 = 18
Luas = p * l
= 12 * 18
= 216 cm2
K = 2(p+l)
2((l + 6)+l) = 60
(2l + 6) = 30
2l = 24
l = 12 cm
p = l + 6
p = 12 + 6
p = 18 cm
Luas = p x l
L = 18 cm x 12 cm
L = 216 cm^2
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