a)
[tex]P_{1} = 7cm * 8cm = 56cm^{2}[/tex]
[tex]P_{2} = \frac{1}{2}[/tex] [tex]( 8cm + 4cm ) * 7cm[/tex] [tex]= 42cm^{2}[/tex]
[tex]P_{c} = 42cm^{2} + 56cm2^{2} = 98cm^{2}[/tex]
b)
[tex]P_{1} = \frac{1}{2}( 16cm + 8cm ) * 5cm = 60cm^{2}[/tex]
[tex]P_{2} = \frac{1}{2}( 16cm + 8cm ) * 4cm = 48cm^{2}[/tex]
[tex]P_{c} = 60cm^{2} + 48cm2^{2} = 108cm^{2}[/tex]
d)
[tex]P_{romb} = \frac{1}{2} * 8cm * 10cm = 40cm^{2} \\P_{kwadrat} = 2cm * 2cm = 4cm^{2}\\ P_{c} = 40cm^{2} - 4cm^{2} =36cm^{2}[/tex]
e)
[tex]P_{1} = \frac{1}{2} * 2cm * 6cm = 6cm^{2} \\P_{2} = 4cm * 2cm = 8cm^{2} \\P_{3} = 6cm * 2cm = 12cm^{2} \\P_{c} = 2P_{1} + 2P_{2} + P_{3} = 2 * 6cm^{2} + 2 * 8cm^{2} + 12cm^{2} = 40cm^{2}[/tex]
