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21 November, 06:49

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

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  1. 21 November, 07:03
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    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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