Jawabanmu

2014-05-20T04:29:19+07:00
K = 4.s
50 = 4.s
50/4 = s
12.5 = s

15/2 = 7.5

√12.5²-7.5²
√156,25-56.25
√100 =10

10.2 = 20 (d₂)

L = 1/2.d₁.d2
   = 1/2.15.20
   = 150 cm²

maaf kalau salah:)