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2p+2l/l = 14 /3
6p+6l = 14l
6p = 14l-6l
6p = 8l
3p = 4l
p = 4/3 l... pers 1
luas = 192
p x l = 192
4/3 l x l = 192
l² = 144
l = 12 cm
p = 4/3 x 12
p = 16 cm
diagonal sisi = d
d² = p²+ l²
= 16² + 12²
= 256 + 144
= 400
d = 20 cm
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luas persegi = sisi²
36 = sisi²
sisi = 6 cm
d² = s² + s²
= 6² + 6²
= 36 + 36
= 72
d = √72
d = 6√2 cm