If a=25cm,b=15cm and c= 20cm ,Find the Value of S-b
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(S)= a+b+c/2
(S)=25+15+20/2
(S)=60/2
(S)=30
area of a triangle=√s(s-a)(s-b(s-c)
=√30(30-25)(30-15)(30-20)
=√30(5)(15)(10)
the value of s-b=(30-15)
=15
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