2 Answers

Pankaj Tiwari · Answer 1 · 2021-02-05T11:08:55+0000

Answer:

l =
$(A-2\pi r)/(\pi r)$

Explanation:

Given

A = 2πr + πrl ( isolate the term in l by subtracting 2πr from both sides )

A - 2πr = πrl ( divide both sides by πr )

$(A-2\pi r)/(\pi r)$ = l

Noel Baron · Answer 2 · 2021-02-08T09:54:07+0000

Answer: l = A/πr - 2

Explanation:

The given equation is

A = 2πr + πrl

The first step is to subtract 2πr from the left hand side and the right hand side of the equation. It becomes

A - 2πr = 2πr + πrl - 2πr

A - 2πr = πrl

The next step is to divide the left hand side and the right hand side of the equation by πr. It becomes

(A - 2πr)/πr = πrl/πr

l = (A - 2πr)/πr

I = A/πr - 2πr/πr

I = A/πr - 2

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