Supplementary angles are those angle that sum up come 180 degrees. For example, edge 130° and angle 50° room supplementary angles due to the fact that sum of 130° and 50° is equal to 180°. Similarly, safety angles add up to 90 degrees. The two supplementary angles, if joined together, kind a right line and also a straight angle.

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But it have to be provided that the two angles that are supplementary to each other, carry out not need 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 one of the crucial branches of math that deals with the study of different shapes. The initiates the research of lines and also angles. A right line is a heat without curves and it is identified as the shortest distance in between two points. An angle is formed when the heat segment meets at a point.

Table that contents:Definition

What are Supplementary Angles?

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

One the its angles is an acute angle and also another edge is an obtuse angle.Both that the angles are appropriate angles.

This means that ∠A + ∠B = 180°.

See the figure below for a much better understanding that the pair of angles that space supplementary.


Examples the Supplementary Angles

Some of the instances of supplementary angle are:

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

Properties of Supplementary Angles

The essential properties that supplementary angle are:

The two angles are said to it is in supplementary angles once they add up come 180°.The two angles with each other make a directly line, however the angles require not be together.“S” of supplementary angles means the “Straight” line. This means they type 180°.

Adjacent and Non-Adjacent Supplementary Angles

There space two varieties of supplementary angles:

Adjacent supplementary anglesNon-adjacent supplementary angles

Adjacent Supplementary angles

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

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


Non-adjacent Supplementary angles

The supplementary angles that execute not have a typical arm and a common vertex are referred to as non-adjacent supplementary angles. The non-adjacent supplementary angles do not share the heat segment or vertex v each other.

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


How to find Supplementary Angles?

As us know, if the amount of two angles is equal to 180°, climate they space supplementary angles. Each of the angles is stated to it is in a supplement of an additional angle. Hence, we have the right to determine the complement of an angle, by subtracting it indigenous 180°.

For example, if you had offered that 2 angles that form supplementary angles. If one angle is ∠A then another angle ∠B is that is supplement. Hence,

∠A = 180° – ∠B (or)

∠B = 180° – ∠A

Supplementary angles Theorem

The supplementary angle theorem says that if two angles room supplementary to the very same angle, then the two angles are stated to it is in congruent.


If ∠x and also ∠y space two various angles that space supplementary to a third angle ∠z, together that,

∠x + ∠z = 180 ……. (1)

∠y + ∠z = 180 ……. (2)

Then, native the above two equations, we deserve to say,

∠x = ∠y

Hence proved.

Supplementary and Complementary Angles

Both supplementary and complementary angles room pairs the angles, that sum up to 180° and 90°, respectively. Let united state find much more differences between the pair that angles.

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

Related Articles

Problems and also Solutions top top Supplementary angles

Question 1: Find the measure 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 are supplementary angles and also ∠x = 67, then uncover ∠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 supplement of angle 65 degrees?Are the angles 80° and 120° supplementary?Find the complement of 140°.

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No, 2 acute angles cannot kind a supplementary angle.By definition, acute angles are the angles that measure up the angle higher than 0° and also less 보다 90°. If you add two acute angles in which each angle is big as possible, its sum will be less than 180°. By the meaning of supplementary angles, the is impossible to obtain the supplementary angle once we add two acute angles.Example: 80° +60° = 140° i beg your pardon is no a supplementary angle.But, in the case, if us add an ext than two acute angles, we can obtain supplementary angles.
No, two obtuse angle cannot form a supplementary angle.By the meaning of obtuse angles, the angles that measure greater than 90° are obtuse. If you include two obtuse angles, the sum will be higher than 180°. It will not accomplish the residential or commercial property of the supplementary angles once we include obtuse angles.Example: 110° + 95° = 205° i beg your pardon is not a supplementary angle. <205° > 180° >
Yes, 2 ideal angles can kind a supplementary angle. We know that as soon as the measure of an angle is precisely 90°, then it is recognized as a right angle.When two right angles are added, the is feasible to get the supplementary angle. Because 90° + 90° = 180°, as it satisfies the problem of supplementary angles.

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