Supplementary Angle Calculator
A 'Supplementary Angle Calculator' is an online tool that finds and displays the supplementary angle of the given angle.
What Is a Supplementary Angle Calculator?
In our Supplementary Angle calculator, you just need to enter the value of an angle that is less than 180°, to get its supplementary angle.
How to Use the Supplementary Angle Calculator?
Follow these steps to use the calculator:
 Step 1: Enter any angle which is less than 180°^{ }in the input box.
 Step 2: Click on "Calculate" to find its supplementary angle.
 Step 3: Click on "Reset" to clear the field and enter the new value.
What Is a Supplementary Angle?
Two angles are said to be supplementary angles if their sum is equal to 180°.
In other words, ∠1 and ∠2 are supplementary if ∠1 + ∠2 = 180°
Therefore, if we know one angle, then we can easily find its supplementary angle by subtracting the given angle from 180°.

Solved Example 1:
Do the angles measuring 130° and 50° form a pair of supplementary angles?
Solution:
The sum of 130° and 50°^{ }is 180° .
So, the angles measuring 130° and 50° form a pair of supplementary angles.

Solved Example 2:
Find the value of x such that x° and 75° form a pair of supplementary angles.
Solution:
If x° and 75° form a pair of supplementary angles, we will solve the equation x° + 75° = 180°^{ }to find the value of x.
x° + 75° = 180°
x° = 180°  75°
x° = 105°
Therefore, the value of x is 105°, which is the supplementary angle of 75°.
Now, use the calculator and find the supplementary angles for the following:
 135°
 23°