Jawabanmu

2014-05-12T20:10:27+07:00
L=2x . 5x . 1/2
720 = 10x² . 1/2
720 = 5x²
x² = 144
x = √144
x = 12

2x ⇒ 2.12 = 24 cm
5x ⇒ 5.12 = 60 cm


1 5 1
2014-05-12T20:50:14+07:00
Perbandingan diagonalnya bisa diganti x dulu
D1 = 2x
D2 = 5x
L.layang-layang = d1 x d2 / 2
                      720= 2x . 5x / 2
              720 x 2 = 10 x²
                 1440 = 10 x²
                       x²= 1440 / 10
                      x²= 144
                     x144    = 12

D1 = 2x = 2. 12 = 24 cm
D2 = 5x = 5. 12 = 60 cm