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F/f = (⅔)²
F/12cm² = ⁴/₉
9F = 4*12cm²
9F = 48cm² /÷9
F = 5⅓cm²
b)
⁶/₁₀ = ⅗
f/F = (⅗)²
12cm²/F = ⁹/₂₅
300cm² = 9F /÷9
F = 33⅓cm²