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Anton Shishkin · Answer 1 · 2019-01-26T09:39:06+0000

Answer:

40 degrees

Step-by-step explanation:

The three angles of any triangle always add up to 180 degrees.

Thus, since we already know 2 angles which add up to 140 degrees, we just need to subtract the two angles we already know from 180 degrees for the third angle.

180-140=40 degrees.

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