The three interior angles of a triangle always add up to 180 degrees, which is one of the identifying characteristics of a triangle. Each shape has properties that are unique to that specific figure. Other identifying properties are that the exterior angles of a trangle always add up to 360 degrees and that a triangle always has three sides.
Know MoreMany combinations of angle can be used to meet the 180 degree requirement. An obtuse triangle has one obtuse angle (an angle that measures between 90 and 180 degrees) and two acute angles (angles that measure less than 90 degrees). A right angle triangle has a single 90 degree angle and two acute angles. The acute triangle is composed of three acute angles.
Learn MoreTwo angles that have the sum of 180 degrees are supplementary angles. Given one supplementary angle A, a person can find the other supplementary angle B by subtracting A from 180 degrees.
Full Answer >A triangle can never have any parallel lines because there must be three angles that add up to 180 degrees, which makes it impossible for the three sides to avoid intersecting. A parallel line can never intersect with another, and triangles must always have intersecting sides.
Full Answer >No matter what type of triangle is in question, there are always three angles in a triangle. The angle sizes vary on the type of triangle, but there are always three that add up to 180 degrees.
Full Answer >A scalene triangle has no equal sides. There is no word for a triangle with three different angle sizes. The words describing angle sizes — right, obtuse and acute — reference the degrees of the angle, not their relationships to one another.
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