Jawabanmu

2014-05-20T19:14:12+07:00
A.) pertama cr dulu pnjg sisi miring alasnya, pk pitagoras :
5^2 + 12^2 = x^2
25 + 144 = x^2
169 = x^2
13 cm = x

Lperm = 2.La + k.tinggi
= 2. 1/2. a.t + (12+13+5). 16 cm
=12. 5 + 30. 16 cm
= 60 cm + 48 cm2
=108 cm2