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If two angles of a triangle have measures of 20 and 40 degrees, what is the measure of the third.

If two angles of a triangle have measures of 20 and 40 degrees, what is the measure of the third.
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If two angles of a triangle have measures of 20 and 40 degrees, what is the measure of the third.

User Tuomas Toivonen
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All 3 angles must add up to 180. So 40 + 20 = 60. Subtract that from 180 and you get 120. There is your answer
User Psddp
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4 votes
The sum of all angles in a triangle is 180.

AngleA+AngleB+AngleC=180
20+40+AngleC=180
AngleC=120
User Aayush Agrawal
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8.9k points
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