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In a triangle, two angles are 43° and 57°. Find the third angle.

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In a triangle, two angles are 43° and 57°. Find the third angle.

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Given two angles of a triangle are 43° and 57°. 

Sum of these two angles = 43° + 57° = 100° 

In a triangle the sum of the interior angles is 180°. 

∴ Third angle = 180° – 100° = 80°

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