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a - podstawa
h = a + 6cm
a = 1/3h
h = 1/3h + 6cm
2/3h = 6cm
h = 9cm
a = 1/3h = 3cm
P = ah/2 = 3cm * 9cm / 2 = 13,5cm²
Odp: Pole tego trójkąta wynosi 13,5cm².
P=50cm₂
P=½ah
50cm=½a*10cm /*2
100cm=10a /÷10
a=10cm
a=1dm