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a=10
b²=c² -a²
b² =18² -10² =324 -100 =224=16*14
b=√(16*14)
b=4√14
1/2 a=5
1/2 b=2√14
d - długość obliczanego odcinka
d²=(1/2 a)² +(1/2 b)²
d² =5² +(2*14)² =25+4*14 =25+56 =81
d=√81
d=9