jawaban dari soal tersebut?

● K = 82 cm
● p = 5 + 2l

jawab:
K = 2(p+l)
82 = 2((5+2l)+l)
82 = 2(5+3l)
82 = 10 + 6l
6l = 82 - 10
6l = 72
l = 12 cm

p = 5 + 2l
p = 5 + 2. 12
p = 5 + 24
p = 29 cm

L = p x l
L = 29 x 12
L = 348 cm²