For the triangle below, which option correctly gives an arrangement of its sides in ascending order of their lengths?

AB, BC, CA

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AB, CA, BC

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AC, AB, BC

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CA, BC, AB

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Solution

The correct option is A
AB, BC, CA

In any triangle, the side opposite to the larger (greater) angle is longer.
The ascending order of the angles is $40^{\circ}, 65^{\circ}, 75^{\circ}$ .
So sides in ascending order will be AB, BC, AC.

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