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y²+3² = 5²
y²+9 = 25
y² = 25 - 9
y² = 16
y = 4
x² + 3² = √13²
x² + 9 = 13
x² = 13 - 9
x² = 4
x = 2
dł podst. - 2 + 4 = 6
P = 1/2 * 6 * 3 = 9