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b=3cm
4*PΔ =4*1/2 *a*b
4PΔ=2*a*b
P=2*3*4 =24cm² odp. c
lub
d=2*4=8cm
d1=2*3=6cm
P=d*d1/2
P=8*6/2 =24cm²
odp a
dasz naj???????
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