Given the angles of the triangle QRS, using the Relationship of sides to interior angles in a triangle, RS is the longest side.
What is Relationship of sides to interior angles in a triangle?
In any triangle,
The shortest side is always opposite the smallest interior angle.
The longest side is always opposite the largest interior angle.
Since, ∠Q = 80° is the largest, side opposite to it, i.e., RS will be the longest.
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