The sum of the measures of two exterior angles of a triangle is 220° what is the measure of the third exterior angle

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02-03-2017
Mathematics

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The sum of the measures of two exterior angles of a triangle is 220° what is the measure of the third exterior angle

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MAMJ MAMJ · Answer 1 · 2017-03-02T20:32:59+01:00

MAMJ MAMJ

02-03-2017

The sum of all exterior angles add up to 360º. To find the missing 3rd exterior angle subtract the sum of the first two exterior angles from the total sum of all exterior angles.

360º - 220º = 140º

The measure of the third exterior angle is 140º.

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