1.

If `A=2(lb+bh+lh)`, then which of the following is/are true?A. `l=(A-2bh)/(2(b+h))`B. `b=(A-2h)/(2(l+b))`C. `h=(A-2lb)/(2(l+b))`D. None of these

Answer» Correct Answer - D
Given `a=2(lb+1h)`.
Making 1 as the subject of the formula.
`A=2(lb+bh+2lh)`
`rArr A=2(lb=lh)+2bh`
Subtracting wbh from both the sides, we get
`A-2bh=2l(b+h)`.
Dividing both the sides with 2(b+h), we get
`(A-2bh)/(2(b+h))=1rArrl=(A-2bh)/(2(b+h))`
Similarly, we get
`therefore b=(A-2lh)/(2(l+h))` and `h=(A-2lb)/(2(l+b))`
Hence, the correct option is (d).


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