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k = 2 (p+ l)
62= 2 x (11 + l + l)
31 = 11 +2 l
l =10
panjang = 11 + 10
= 21
2. cari panjang dan lebar untuk mempermudah digambar terlebih dulu =)
panjang = 7-1
= 6
lebar = 7-1
= 6
keliling = 2 (p + l)
= 2x 12
= 24