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P=a*h
P=13*24
P=312cm(2)
h2= ?
P=a*h2
312=13*h2
h2=312/13
h2=24cm
144+x²=²169
x²=25
x=5
druga przekątna ma 10cm
z pitagorasa
13²=12²+x²
169=144+x²
x²=169-144
x²=25
x=5
5•2=10
odp:druga przekątna ma 10cm