2 Answers

Leonard Richardson · Answer 1 · 2022-04-08T19:06:45+0000

Answer:

A

Explanation:

We know that , the angle sum property of a triangle is 180°. That is the sum of all angles in a triangle is equal to 180 degree .

On adding all the angles :-

$:\implies$ 3x+14°+45°+85° = 180°

$:\implies$ 3x + 144° = 180°

$:\implies$ 3x = 180° - 144°

$:\implies$ 3x = 36°

$:\implies$ x = 36°/3

$:\implies$ x = 12°

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