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a²+b²=(15)²
a²+b²=225
P=½a*b
P=½*15*h
3²+h²=a²
12²+h²=b²
a²+b²=225
9+h²+144+h²=225
2h²=225-153
2h²=72 /:2
h²=36
h=6cm
proszę :)