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przekatna x=10cm to 1/2x=5cm
z pitagorasa
5²+(1/2y)²=13²
25+1/4 y²=169
1/4y²=169-25
1/4y²=144
y=144:1/4=144·4
y²=576
y=√576=24
pole rombu
P=1/2·x·y=1/2·10·24=120cm²