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4/9x - szerokosc prostokata
x * 4/9x = 25
x² = 25 : 4/9
x² = 56.25
x = 7,5
4/9x = 4/9 * 7,5 = 3 i 1/3
ob = 7,5 +7,5 + 3 i 1/3 + 3 i 1/3 = 21 i 2/3
szerokość= ⁴/₉ ×7,5= ¹⁰/₃
x*4/9x=25/√
2/3x=5/ : 2/3
x= 7 i 1/2
L= 2×¹⁰/₃ + 2× 7,5
L= 21 i 2/3 cm