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l = x - 1
kll = 60 cm
kll = 2p + 2l
60 = 2(x+3) + 2(x-1)
60 = 2x + 6 + 2x - 2
60 = 4x + 4
60 - 4 = 4x
56 = 4x
x = 14
p = x + 3
= 14 + 3 = 17
l = x - 1
= 14 - 1 = 13
l = p x l
= 13 x 17
= 221
60 = 2 ( x+ 3) + 2 ( x - 1)
60 = 2x + 6 + 2x - 2
60 = 4x + 4
60 - 4 = 4x
56 = 4x
14 = x
panjang = 14 + 3
= 17cm
lebar = 14 - 1
= 15cm
Luas = p × l
= 17 × 15
= 255 cm²
ma'af kalau ada yg sallah!!!