Final answer:
The triangle with angles 30 degrees, 130 degrees, and 20 degrees is an obtuse triangle since it has one angle greater than 90 degrees.
Step-by-step explanation:
The given triangle has angles of 30 degrees, 130 degrees, and 20 degrees. Sum of the angles in a triangle is always 180 degrees, which seems correct as 30 degrees + 130 degrees + 20 degrees = 180 degrees. A triangle is classified as acute if all its angles are less than 90 degrees, right if one of its angles is 90 degrees, and obtuse if one of its angles is greater than 90 degrees. Here, since one of the angles is greater than 90 degrees (130 degrees), it is classified as an obtuse triangle.
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