Odpowiedź:
1. Ob = 4a
26dm = 4a
a = 6,5dm
P = a²
P = 6,5dm * 6,5dm
P = 42,25dm²
2. P = a²
P = (6cm)²
P = 36cm²
3. P =a*h
P = 8cm * 3cm
P = 24cm²
5. P = [tex]\frac{e * f}{2}[/tex]
4dm = 40cm
P = [tex]\frac{14cm * 40cm}{2}[/tex]
P = 14cm * 20cm
P = 280cm²
6. P = [tex]\frac{a * h}{2}[/tex]
P = [tex]\frac{7cm * 6cm}{2}[/tex]
P = 7cm * 3cm
P = 21cm²
7. P = [tex]\frac{(a+b) * h}{2}[/tex]
P = [tex]\frac{(2cm + 8cm) * 4cm}{2}[/tex]
P = [tex]\frac{10cm * 4cm}{2}[/tex]
P = 10cm * 2cm
P = 20cm²