A triangle has one 60 degree angle and one 20 degree angle. The third angle in the triangle must be a.acute b.obtuse c.commplementary d.straight

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asked Feb 19, 2019 57.4k views

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Leonid Mednikov · Answer 1 · 2019-02-23T17:00:36+0000

The 3rd angle has to be b. obtuse because a triangle's angles must add to 180°. 20° and 60° add to 80, and you must have a 100° for them to add to 180°. Any angle above 90° is known as an obtuse angle, so that's your answer.

A triangle has one 60 degree angle and one 20 degree angle. The third angle in the triangle must be a.acute b.obtuse c.commplementary d.straight

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