$\"\"$

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Mollweide’s Formula : $\"\"$ and $\"\"$ .

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Consider $\"\"$ .

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Substitute corresponding values in the above equation.

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$\"\"$

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$\"\"$

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The sum of angles in triangle is $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in equation (1).

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$\"\"$

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Hence $\"\"$ .

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$\"\"$

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$\"\"$ .

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