Question

No 31 tlg dijawab gays! thx

Answer 1

K = 2(p+l)
64 = 2(5y + 3y)
64 = 2(8y)
64 = 16y
64 : 16 = y
4 = y

luas = p x l
luas = 5y x 3y
luas = 15y²
luas = 15 (4)²
luas = 15 x 16
luas = 240 cm²

Answer 2

Kll persegi panjang = 2(p + l)
64 = 2(5x + 3x)
64 = 2(8x)
64 = 16x
  x = 4

panjang = 5x = 5(4) = 20cm
lebar = 3x = 3(4) = 12cm

luas = p x l
         20 x 12
         240cm² (a)