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Explain how knowing 1+7 helps you find the sum for 7+1

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maksim [4K]2 years ago

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Let the measure of each side of the square be " x " cm.

then ,

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$x + \frac{x}{2} + x + \frac{x}{2} = 36 \\ \\ \frac{2x + x + 2x + x}{2} = 36 \\ \\ \frac{6x}{2} = 36 \\ \\ 6x = 36 \times 2 \\ \\ 6x = 72 \\ \\ 6x = \cancel{\frac{72}{6} } = 12cm$

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