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l = x+2 cm
k = 26 cm
k= 2.(3x-5+x+2)
26 = 2.(4x-3)
13 = 4x-3
4x = 16
x = 4
p = 7 cm
l = 6 cm
L = p.l
= 7.6
= 42 cm²........opsi D
diketahui:
persegi panjang
panjang (p) = (3x - 5) cm
lebar (l) = (x + 2) cm
Keliling (K) = 26 cm
ditanya : luas (L)?
jawab:
cari nilai x ,
K = 2p + 2l
26 = 2 (3x - 5) + 2(x + 2)
26 = 6x - 10 + 2x + 4
26 = 8x - 6
8x = 26 + 6
8x = 32
x = 32/8
x = 4
panjang persegi panjang (p) :
= (3x - 5)
= 3(4) - 5
= 12 - 5
= 7 cm
lebar persegi panjang (l) :
= (x + 2)
= 4 + 2
= 6 cm
jadi, luas persegi panjang :
L = p x l
L = 7 cm x 6 cm
L = 42 cm²
(Jawaban D)