Jawabanmu

2014-01-10T19:42:46+07:00
Panjang = 2 × lebar .
luas = p × l
98 = 2×lebar × lebar
98/2 = lebar^2
49 = lebar^2
7 = lebar  
panjang = 2 × lebar = 2 × 7 = 14 cm

K = 2 (p + l)
   = 2 (14 + 7)
   = 28 + 14
   = 42