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b. keliling = 2p + 2l
= 2(4x) + 2(4x-3)
= 8x + 8x - 6
= 16x - 6
c. Luas = p x l
= (4x) (4x-3)
= 16 - 12x
7) Luas seluruhnya = p x l = (9x - 12) . 9
= 81x - 108
Luas yg diarsir = (6x-12) . 4
= 24x - 48
Luas yg tidkdiarsr = luas sluruhnya - luas yg diarsir
= (81x-108) - (24x-48)
= 81x - 108 -24x + 48
= 57x - 60