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P₁= 1/5 P₂ (tak wynika z podobieństwa)
P₂= 17 cm²
P₁= 1/5 * 17 cm²
P₁= 3,4 cm²
lub
P₁= 17 cm²
17 cm² = 1/5 * P₂
P₂= 85 cm²