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k = 2(p+l)
k = 2(l+9+l)
k = 2(2l+9)
74 = 4l+18
4l = 72-18
l = 56/4
l = 14 cm
p = 14 + 9 = 23
L=23kali14 = 322
p = 9 + l
K = 74 cm
Maka,
K = 2(p + l)
74 = 2(p + l)
37 = p + l
Masukkan p,
37 = p + l
37 = (9 + l) + l
37 = 9 + 2l
37 - 9 = 2l
28 = 2l
l = 28/2
l = 14 cm
Masukkan l,
37 = p + l
37 = p + 14
p = 37 - 14
p = 23 cm
Sehingga,
L = p x l
L = 23 x 14
L = 322 cm²
Semoga membantu . . .