Supplementary angles are those angles that amount up come 180 degrees. For example, edge 130° and angle 50° room supplementary angles because sum of 130° and 50° is same to 180°. Similarly, complementary angles include up to 90 degrees. The 2 supplementary angles, if joined together, type a directly line and also a directly angle.

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But it have to be noted that the 2 angles that are supplementary to each other, execute not have to be next to each other. Hence, any kind of two angles deserve to be supplementary angles, if their sum is same to 180°.

Geometry is just one of the essential branches of math that encounters the study of different shapes. The initiates the study of lines and also angles. A right line is a line without curves and it is defined as the shortest distance between two points. An edge is developed when the line segment meets in ~ a point.

Table of contents:Definition

What room Supplementary Angles?

In Maths, the definition of supplementary is concerned angles that make a directly angle together. It means, 2 angles are claimed to it is in supplementary angle when they include up come 180 degrees. Two angles are supplementary, if

One that its angles is an acute angle and another angle is one obtuse angle.Both of the angle are ideal angles.

This method that ∠A + ∠B = 180°.

See the figure listed below for a much better understanding that the pair of angle that room supplementary.


Examples the Supplementary Angles

Some that the examples of supplementary angles are:

120° + 60° = 180°90° + 90° = 180°140° + 40° = 180°96° + 84° = 180°

Properties of Supplementary Angles

The necessary properties the supplementary angle are:

The two angles are claimed to be supplementary angles as soon as they include up come 180°.The two angles together make a directly line, however the angles require not it is in together.“S” that supplementary angles stands for the “Straight” line. This way they form 180°.

Adjacent and Non-Adjacent Supplementary Angles

There space two species of supplementary angles:

Adjacent supplementary anglesNon-adjacent supplementary angles

Adjacent Supplementary angles

The supplementary angle that have a common arm and a common vertex space called surrounding supplementary angles. The adjacent supplementary angles share the typical line segment and also vertex with each other.

For example, the supplementary angle 110° and also 70°, in the offered figure, are surrounding to each other.


Non-adjacent Supplementary angles

The supplementary angle that perform not have actually a usual arm and also a usual vertex are dubbed non-adjacent supplementary angles. The non-adjacent supplementary angles carry out not re-publishing the line segment or vertex with each other.

For example, the supplementary angles 130° and 50°, in the offered figure, room non-adjacent to every other.


How to uncover Supplementary Angles?

As us know, if the sum of 2 angles is equal to 180°, climate they space supplementary angles. Each of the angles is stated to be a complement of an additional angle. Hence, we can determine the supplement of an angle, by subtracting it indigenous 180°.

For example, if you had offered that two angles that type supplementary angles. If one angle is ∠A then another angle ∠B is that is supplement. Hence,

∠A = 180° – ∠B (or)

∠B = 180° – ∠A

Supplementary angle Theorem

The supplementary edge theorem says that if two angles are supplementary come the exact same angle, climate the two angles are stated to be congruent.


If ∠x and ∠y room two various angles that space supplementary come a third angle ∠z, such that,

∠x + ∠z = 180 ……. (1)

∠y + ∠z = 180 ……. (2)

Then, indigenous the over two equations, we deserve to say,

∠x = ∠y

Hence proved.

Supplementary and Complementary Angles

Both supplementary and complementary angles are pairs the angles, that amount up come 180° and also 90°, respectively. Let us find an ext differences in between the pair the angles.

Complementary AnglesSupplementary Angles
Sum of 2 angles is 90°Sum of two angles is 180°
Ex: ∠A + ∠B = 90°.Ex: ∠A + ∠B = 180°.
Complementary angles form a right-angled triangle when linked together.Supplementary angles kind a straight line.
The match of an angle A is (90 – A)°The complement of an edge A is (180 – A)°

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Problems and Solutions top top Supplementary angles

Question 1: Find the measure up of one unknown angle from the offered figure.



We understand that the supplementary angles include up come 180°.

X + 55° + 40° = 180°

X + 95° = 180°

X = 180°- 95°

X = 85°

Therefore, the unknown angle, X = 85°

Question.2: If ∠x and ∠y are supplementary angles and also ∠x = 67, then uncover ∠y.

Solution: Given, ∠x and also ∠y room supplementary angles


∠x = 67°

Since, ∠x + ∠y = 180°

∠y = 180 – ∠x 

∠y = 180 – 67

∠y = 113°

Practice Questions

What is the complement of edge 65 degrees?Are the angles 80° and also 120° supplementary?Find the supplement of 140°.

Stay tuned v BYJU’S – The Learning application to discover the mathematical ideas and additionally watch engaging videos to find out with ease.
No, two acute angles cannot form a supplementary angle.By definition, acute angles are the angles that measure the angle greater than 0° and also less 보다 90°. If you include two acute angles in which every angle is big as possible, its sum will be less than 180°. Through the definition of supplementary angles, that is difficult to gain the supplementary angle as soon as we add two acute angles.Example: 80° +60° = 140° i beg your pardon is not a supplementary angle.But, in the case, if us add an ext than two acute angles, us can get supplementary angles.
No, 2 obtuse angle cannot kind a supplementary angle.By the an interpretation of obtuse angles, the angles that measure greater than 90° room obtuse. If you include two obtuse angles, the amount will be better than 180°. It will certainly not meet the residential property of the supplementary angles when we include obtuse angles.Example: 110° + 95° = 205° i beg your pardon is no a supplementary angle. <205° > 180° >
Yes, 2 right angles can type a supplementary angle. We understand that as soon as the measure up of an edge is exactly 90°, then it is well-known as a best angle.When two ideal angles room added, that is feasible to obtain the supplementary angle. Due to the fact that 90° + 90° = 180°, together it satisfies the problem of supplementary angles.

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Supplementary and also complementary both are various angles. Supplementary add upto 180 degrees whereas complementary angles add to 90 degrees.