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27-11-2018
Mathematics

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If two angles in a triangle add up to138, then what is the size of the third angle

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27-11-2018

Answer:

42 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 138 degrees, we just need to subtract the two angles we already know from 180 degrees for the third angle.

180-138=42 degrees.

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