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2010-02-03T16:21:17+01:00
A)
9cm*15cm = 135cm2
12cm*15cm = 180cm2
5cm * 15cm = 75cm2
Pb = 135 + 180 + 75
Pb = 390cm2

b)
15cm*25cm = 375cm2
10cm*25cm = 250cm2
5cm*25cm = 125 cm2
6cm*25cm = 150cm2

Pb = 900cm2

c)
30cm * 10cm = 300cm2 * 2 = 600 cm2
3cm*10cm*2 = 60cm2

Pb = 660cm2

d)
Pb = 12cm*9cm*6 = 648 cm2
5 4 5