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Use of Algebraic Expressions in Formula of Perimeter of Figures

If two adjace...

Question

If two adjacent sides of a rectangle are $4 x + 7 y$ and $3 y - x$ , find its perimeter.

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Solution

Two adjacent sides of a rectangle are $4 x + 7 y$ and $3 y - x$
Perimeter= $2 (4 x + 7 y + 3 y - x) = 2 (3 x + 10 y) = 6 x + 20 y$

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