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b=?
c=17
a²+b²=c²
15²+b²=17²
225+b²=289
b²=289-225
b²=64/√
b=8cm
15²+b²=17²
225+b²=289 / -225
b²=64
b=√64
b=8
odp. druga przyprostokątna ma 8 cm.