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r=½(a+b-c)
c=przeciwprostokatna
a=12
2=½(12+b-c) /×2
12+b-c=4
b-c=4-12
b-c=-8
b=c-8
a²+b²=c²
12²+(c-8)²=c²
144+c²-16c+64=c²
208=16c
c=208:16
c=13
b=13-8=5
pole=½ab=½×12×5=30j.²