Jawabanmu

2014-08-28T19:59:55+07:00
Diket :
P1 = 20 cm
L1 = 16 cm
L2 = 16+4+4 = 20 cm

Ditanya :
P1 = 20 +4 + x = 24+ x

Jawab:
16 :24 = 20 : (24+x)
20.24 : 16 = 24 +x
30 = 24 + x
x = 30-24
x=6

Maka P1 = 24 =x = 24+6= 30 cm
Maka luas karton = P2.L2 = 30.24 =720 cm2.