Jawabanmu

2014-03-28T20:03:55+07:00
Keliling:
= sisi AB + sisi BC + sisi CA
= ( \frac{x}{2} + 1) + (x + 1) + (3x + 2)
= 4 \frac{x}{2} + 4
2014-03-29T00:08:08+07:00
(    x      ) + (x+1) + (3x+2) = x + x + 3x + 1 + 2 per 2 + 1
  2+1
                                       = 5x + 3 per 3 = 5x