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x=pole trójkąta
2x=pole trapezu
x+2x=225cm²
3x=225cm² /:3
x=75cm²
pole trójkąta-75cm²
pole trapezu-225cm²-75cm²=150cm²
P trójkąta=a×h/2
a×h=2P
a=2P/h
a=2×75cm²/15cm
a=150cm²/15cm
a=10cm