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zatem:
2dm=20cm
Pr= 1/2* dwie przekatne
Pr=1/2*11*20=110cm²
V=1/2 *a*b
2dm =20 cm
V=1/2 *20 *11=11*10=110 cm
d₂=20cm
p=½d₁×d₂
p=½11×20
p=110cm²