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30cm-2cm=28cm
100%=30cm
30cm × 25%= 30 × ²⁵/₁₀₀ = 15× ²⁵/₅₀=3× ²⁵/₁₀= ⁷⁵/₁₀₀=7,5cm
I prostokąt
P=ab
a=6,5cm
b=7,5cm
P=6,5×7,5
P=48,75cm²
II prostokąt
P=a²
a=7,5cm
P=7,5×7,5
P=56,25cm²