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a*h/2
3h\2=16 |*2
3x=32 |:3
x=10 i 2/3
h=10 i 2/3
bok= 21 i 1/3
P= 16cm2
a= 2h
h= ?
P= 1/2 a*h
P= 1/2 2h*h
P= h*h
P= h2
16cm2= h2
h= pierwiastek z 16
h= 4cm
a= 2h
a= 8cm
Odp. Podstawa ma 8cm, a wysokość 4cm.