Jawabanmu

2014-08-25T20:34:51+07:00
A = 2x-1 = 5cm
B = 4x+5 = 17cm
C = 8x+4

Keliling = 14x+8 = 50cm
14x = 42, x=3.

Luas = 5cm*17cm/2 = 42,5cm^2