Let us recall what do we mean by a straight line and what does it form?Ī straight line is an infinite length line that does not have any curves on it. This means that the angles, 130 o and 50 o, since their sum are 180 o, therefore the angle 130 o is the supplement of 50 o and vice versa.īefore moving ahead with the concept of supplementary angles, it is important to recall two other important concepts in geometry, namely, straight line and adjacent angles. when two angles are supplementary angles, they are said to be supplements of each other. When the sum of two angles is 180 o, i.e. Together, the supplementary angles form a straight line. For example, two angles, 130 o and 50 o are supplementary because their sum, 130 o + 50 o = 180 o. Two angles are said to be supplementary if their sum is 180 o. Therefore, the combination of these two words means “something when supplied to complete a thing”. So, how do we define supplementary angles? Let us find out. Here, the word “Supplere” means “supply”, while the meaning of the word “Plere” is “fill”. The word “supplementary” has been derived from two Latin words “Supplere” and “Plere”. Where did this term supplementary come from? The Origin of the word Supplementary Let us understand what supplementary angles are all about.īefore we look into the concept of supplementary angles, let us first understand the meaning of the term supplementary. One of the important terms in geometry is supplementary angles. Depending upon the placement of the angles, there may be adjacent angles, opposite angles, corresponding angles, alternate angles and so on. Similarly, a pair of angles can be complementary angles or supplementary angles depending upon their sum. For example, an angle may be a right angle, an acute angle or an obtuse angle, depending upon the angle it makes with a straight line. In geometry, different names are given to different angels and their combinations depending upon the type of angles they make.
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