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15cm ² = 1/2 × 5cm × h
15cm² = 2,5cm × h
h = 15cm² : 2,5cm
h = 6
P=15
a=5
P=0,5*a*h
15=0,5*5*h
2,5h=15
h=6
odp: wysokość trójkąta wynosi 6cm
a=5
P=15
15=5*h/2 /*2
30=5*h /:5
h=6cm