Jawabanmu

2014-06-06T16:48:02+07:00
L.a = 1/2 x 20 x 21 = 210

V = L.a x T
     210 X 40
     8400 (A)
2014-06-06T17:07:24+07:00
Volume= luas alas * t prisma
Volume= a*t :2 * tprisma
volume= 21*20:2*40
Volume=21*10*40
Volume=8.400 cm kubik