Tolong dibantu no3 dan 4

3. p. kardus = 5. 45
= 225
l. = 20
t. = 30
L kardus= 2( pl + pt + lt)
= 2( 225.20 + 225. 30 + 20.30)
= 2( 4500+ 6750+ 600)
= 2( 11.850
= 23.700

4. N kawat = 4( p +l+t)
=4(30+12+20)
= 4(62)
= 248 cm
h. kawat seluruhnya= n. kawat x h. kawat
= 248 x 200
= 49.600

3. 45 x 20(5) x 30 = p x l x t (kardus)

Luas permukaan kardus = 2(45*100) + 2 (45*30) + 2(100*20) = 2*4500 + 2*1350 + 2*2000= 9000 + 2700 + 4000 = 15700

4. 4p+4l+4t = 4(30) + 4(12) + 4(20) = 120+48+80 = 248 cm

248 x 200 = rp 49.600