Jawabanmu

2014-04-24T17:30:03+07:00
Luas alas = 32 x 18 = 576
Luas Selimut = (2 x ( 1/2 x 32 x 12 )) + (2 x (1/2 x 18 x 12))
                    = (2 x 192 ) + (2 x 108)
                    = 384 + 216
                    = 600

Luas permukaan = Luas alas + luas selimut = 576 + 600 = 1176
2 3 2
2014-04-24T17:31:15+07:00
Lp = L alas + selimut
Lp = p.l + 2( \frac{1}{2} . p.sisi miring +  \frac{1}{2} l. sisi miring
Lp= 32.18 + 2( \frac{1}{2} .32.20 +  \frac{1}{2} 18.15
Lp= 576 + 2(320 + 135)
Lp= 576 + 2(455)
Lp= 576 + 910 = 1486