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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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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

User Alex Johnson
by
8.0k points

1 Answer

3 votes
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.
User Leonid Mednikov
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8.2k points
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