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X²=8²-5²
x²=64-25
x²=39
x=√39
y²=13²-5²
y²=169-25
y²=144
y=12cm
dłuzsza podstawa ma :5+√39+12cm=17+√39cm
obwód:5+8+17+√39+13=(43+√39)cm
pole=½(√39+17+5)×5=(55+2,5√39)=2,5(22+√39)cm²