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32=(2x2a+5) +(2x2a-1)
32=4a+10 + 4a-2
32=4a+4a+10-2
32=8a+8
32-8=8a
24=8a
a =24:8
a= 3
32 = 2 (2a+5) + 2 (2a-1)
32 = 4a + 10 +4a -2
32 = 8a + 8
32-8 = 8a
24 = 8a atau 8a = 24
a = 24/8
a = 3
jadi panjang = 2a + 5
= 2 (3) + 5
= 6 + 5
= 11
lebar = 2a-1
= 2(3) - 1
= 6 -1
= 5
pembuktian
kelliling = 2p + 2l
= 2 (11) + 2 (5)
= 22 + 10
= 32