Supplementary angles room those angle that amount up come 180 degrees. Because that example, angle 130° and also angle 50° room supplementary angles due to the fact that sum that 130° and 50° is equal to 180°. Similarly, complementary angles include up to 90 degrees. The two supplementary angles, if join together, kind a right line and also a directly angle.

You are watching: Find the complement and supplement of an angle

But it need to be listed that the two angles that are supplementary to each other, do not need to be alongside each other. Hence, any two angles deserve to be supplementary angles, if their amount is same to 180°.

Geometry is one of the vital branches of mathematics that deals with the examine of various shapes. That initiates the research of lines and also angles. A straight line is a heat without curves and also it is characterized as the shortest distance in between two points. An angle is developed when the line segment meets in ~ a point.

Table the contents:Definition

What space Supplementary Angles?

In Maths, the definition of supplementary is related to angles the make a directly angle together. The means, 2 angles are claimed to be supplementary angles when they add up come 180 degrees. Two angles space supplementary, if

One that its angle is an acute angle and also another angle is an obtuse angle.Both the the angles are right 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 of Supplementary Angles

Some that the examples of supplementary angle are:

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

Properties of Supplementary Angles

The vital properties that supplementary angle are:

The 2 angles are said to be supplementary angles when they include up come 180°.The two angles with each other make a directly line, yet the angles need not be together.“S” of supplementary angles represents the “Straight” line. This method they form 180°.

Adjacent and also Non-Adjacent Supplementary Angles

There room two species of supplementary angles:

Adjacent supplementary anglesNon-adjacent supplementary angles

Adjacent Supplementary angles

The supplementary angles that have actually a typical arm and also a common vertex space called nearby supplementary angles. The adjacent supplementary angles share the typical line segment and also vertex v each other.

For example, the supplementary angles 110° and also 70°, in the provided figure, are nearby to each other.


Non-adjacent Supplementary angles

The supplementary angles that carry out not have a common arm and also a common vertex are called non-adjacent supplementary angles. The non-adjacent supplementary angles execute not re-publishing the heat segment or vertex v each other.

For example, the supplementary angle 130° and also 50°, in the given figure, room non-adjacent to every other.


How to uncover Supplementary Angles?

As we know, if the sum of two angles is same to 180°, then they space supplementary angles. Each of the angle is said to it is in a supplement of an additional angle. Hence, we can determine the supplement of one angle, by subtracting it native 180°.

For example, if you had provided that 2 angles that type supplementary angles. If one edge is ∠A then an additional angle ∠B is its supplement. Hence,

∠A = 180° – ∠B (or)

∠B = 180° – ∠A

Supplementary angles Theorem

The supplementary edge theorem says that if 2 angles are supplementary to the very same angle, then the two angles are said to be congruent.


If ∠x and ∠y are two different angles that space supplementary come a third angle ∠z, together that,

∠x + ∠z = 180 ……. (1)

∠y + ∠z = 180 ……. (2)

Then, native the over two equations, we have the right to say,

∠x = ∠y

Hence proved.

Supplementary and also Complementary Angles

Both supplementary and also complementary angles room pairs that angles, that amount up come 180° and 90°, respectively. Let us find more 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 kind a right-angled triangle when an unified together.Supplementary angles type a directly line.
The match of an edge A is (90 – A)°The complement of an edge A is (180 – A)°

Related Articles

Problems and Solutions top top Supplementary angles

Question 1: Find the measure up of an unknown angle from the provided figure.



We recognize 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 also ∠y space supplementary angles and also ∠x = 67, then find ∠y.

Solution: Given, ∠x and ∠y space 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 with BYJU’S – The Learning application to find out the mathematical concepts and additionally watch engaging videos to discover with ease.
No, two acute angles cannot type a supplementary angle.By definition, acute angles room the angle that measure up the angle greater than 0° and also less 보다 90°. If you include two acute angle in which every angle is big as possible, its amount will be much less than 180°. Through the meaning of supplementary angles, that is difficult to get 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 much more than 2 acute angles, us can acquire supplementary angles.
No, 2 obtuse angle cannot kind a supplementary angle.By the an interpretation of obtuse angles, the angle that measure higher than 90° room obtuse. If you add two obtuse angles, the amount will be higher than 180°. It will certainly not fulfill the building of the supplementary angles when we include obtuse angles.Example: 110° + 95° = 205° i beg your pardon is not a supplementary angle. <205° > 180° >
Yes, 2 ideal angles can form a supplementary angle. We recognize that once the measure of an edge is precisely 90°, climate it is well-known as a right angle.When two ideal angles room added, it is possible to obtain the supplementary angle. Due to the fact that 90° + 90° = 180°, as it satisfies the problem of supplementary angles.

See more: Iwtl How To Tie A Cherry With Your Tongue, How Do You Tie A Cherry Stem With Your Tongue

Supplementary and complementary both are different angles. Supplementary include upto 180 degrees whereas complementary angles include to 90 degrees.