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x²=25+6,25
x²=31,25
x=√31,25
x=ok.5,59
Odp. Drabina ma ok. 5,59 m
a² + b² = c²
a= 5m
b=2.5m
c=długość drabiny
(5m)²+(2.5m)²=c²
25m²+6.25m²=c²
31.25m²=c²
c ≈5.59