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In r(1)=(A)/(s-a), if A=12cm^(2),r(1)=4c...

In `r_(1)=(A)/(s-a)`, if `A=12cm^(2),r_(1)=4cm and a=3cm` then find s making s as the subject.

A

6 cm

B

8 cm

C

12 cm

D

16 cm

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The correct Answer is:
A
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