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b=10cm
P=ab/2
P=5*10/2
P=50/2
P=25cm²
a²+b²=c²
5²+10²=c²
25+100=c²
c²=125
c=√125
c=√25*5
c=5√5
P=c*h/2
25=5√5*h/2 |*2
50=5√5*h
5√5h=50 |;5√5
h=50/5√5
h=50*5√5 / 5√5*5√5
h=250√5 / 125
h=2√5
odp.Wysokośc ma długość 2√5 cm. ;]