​Find r .

Dear Student,
Please find below the solution to the asked query:

We havea=30b=37c=13s=a+b+c2=30+37+132=40s-a=40-30=10s-b=40-37=3s-c=40-13=27=ss-as-bs-c=40×10×3×27=22×102×92=2×10×9=180r=sPut the values and find the answerr=18040=4.5 units 

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