1 Answer

Diganta Kumar · Answer 1 · 2022-11-25T20:18:32+0000

Answer:

β = 140 - α

we know that the "missing" angle is 40° since 40 + 140 = 180

we also know that the total sum of angles in a triangle is 180

so β = 180 - 40 - α

or β = 140 - α

Explanation:

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