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b. 2(2a+5) + 2(2a-1) = 32
4a + 10 +4a - 2 = 32
8a + 8 = 32
8a = 32-8 -> 24
a = 24/8
a = 3
panjang: 2.3+5 = 11
lebar: 2.3-1 =5
32 = 2((2a+5)+(2a-1))
32 = 2(4a+4)
32 = 8a+8
24 = 8a
a = 3
panjang = (2a+5) = (2x3+5) = 6+5 = 11
lebar = (2a-1) = (2x3-1) = 6-1 = 5