Now that we understand the definitions of adjacent and nonadjacent angles, we can see that adjacent supplementary angles are two angles that share a side and vertex and add up to 180 degrees. Nonadjacent AnglesĪngles are adjacent when they share a common side and a common vertex.Īngles 1 and 2 are nonadjacent, while angles 3 and 4 are - they share a common side and vertex. Supplementary angles are two angles that add up to 180 degrees (Figure 3). Vertical angles, or opposite angles, are the two angles directly opposite each other when two straight lines cross (Figure 1).Ĭomplementary angles are two angles that add to 90 degrees (Figure 2). There are also names given to pairs of angles. If the measure of an angle is equal to 180 degrees, it’s known as a straight angle. An angle greater than 90 degrees is an obtuse angle. If an angle is less than 90 degrees, it’s an acute angle. If the measure of the angle is exactly 90 degrees, it’s known as a right angle. In geometry, we give different names to different types of angles depending on the measure of the given angle: right angles, adjacent supplementary angles, vertical angles.
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