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a=dł. dłuzszej= 4b=4*3=12cm
h=szukana wysokosc
P=1/2 (a+b) h
60=1/2( 3+12) h /*2
120=15h
h=120/15
h=8cm
a=3cm
b=4a
P=(a+4a)h/2
P=60cm²
60cm²=5ah/2
120cm²=5ah
120cm²=15h
h=8cm