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a,c=dł. boków
a=24cm
c=20cm
R=a*c² / 4 pola
h=wysokosc
1/2a=12cm
z pitagorasa:
h=√[c²-(1/2a)²]=√[20²-12²]=√256=16
pole=1/2ah=1/2*24*16=192
R=24*20² / 4*192=9600/768=12,5 cm