Jawapan

2015-08-27T12:24:19+08:00
Keliling = 2 × (p+l)
      40 = 2 × (p+l)
   p + l = 40 : 2
   p + l = 20 m

jumlah perbandingan = 5 + 3 = 8
p = 5/8 × 20 m = 12.5 m
l = 3/8 × 20 m = 7.5 m

Luas = 12.5 × 7.5 m²
         = 93.75 m²