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r=2
a=12
b=2+x
c=10+x
12²+(2+x)²=(10+x)²
144+4+4x+x²=100+20x+x²
144+4+4x=100+20x
148-100=16x
48=16x /:16
x=3
a=12
b=5
P=1/2*a*b
P=1/2*5*12
P=30