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4²+3²=c²
16+9=c²
25=c²/√
c=√25
c=5
AC=5
a²+b²=c²
4²+3²=c²
16+9=c²
25=c²/√
c=√25
c=5
CB=5
a²+b²=c²
a=5 b=5
5²+5²=c²
25+25=c²
50=c²/√
c=√50=√5×10
c=5√10
Odp.:Trójkąt nie jest prostokątny.