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32 = 2 ( 2a + 5 + 2a - 1)
16 = 4a + 4
20 = 4a
5 = a
p = 2a + 5 = 10 + 5 = 15 cm
l = 2a - 1 = 10 - 1 = 9 cm
32m = 2 ( 2a +5 +2a -1 )
32m = 2 (4a + 4)
32m = 8a + 8
32m - 8= 8a
24m = 8a
24/8 = a
3 = a
panjang =
2a + 5
= 2(3) +3
=5 = 6+5
= 11
lebar =
2a-1
=2(3) -1
=6-1
=5