Please answer the question in the attachment
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Answer: let,
a=12+x
b=12+9=21cm
c=9+x
According to heron's formula
S=a+b+c/2
=12+x+12+9+9+x/2
=2x+42/2
=2(x+21)/2
=x+21
Area given=189 cm^2
Area=sr
189=x+21*6
189/6=x+21
31.5=x+21
X=31.5-21
X=10.5
QR=12+9=21cm
PQ=12+x
=12+10.5=22.5 cm
PR=x+9
=10.5+9=19.5 cm
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