Complementary Angle Calculator
A 'Complementary Angle Calculator' is an online tool which finds and displays the complementary angle of the given angle.
What Is a Complementary Angle Calculator?
In our Complementary Angle Calculator, you just need to enter the value of an angle which is less than 90°, to get its complementary angle.
How to Use the Complementary Angle Calculator?
Follow these steps to use the calculator:
 Step 1: Enter any angle which is less than 90°^{ }in the input box.
 Step 2: Click on "Calculate" to find its complementary angle.
 Step 3: Click on "Reset" to clear the field and enter the new value.
What Is a Complementary Angle?
Two angles are said to be complementary if their sum is equal to 90°.
In other words, ∠1 and ∠2 are complementary if ∠1 + ∠2 = 90°.
Therefore, if we know one angle, then we can easily find its complementary angle by subtracting the given angle from 90°.

Solved Example 1:
Do the angles measuring 50° and 40° form a pair of complementary angles?
Solution:
The sum of 50° and 40°^{ }is 90°.
So, the angles measuring 50° and 40° form a pair of complementary angles.

Solved Example 2:
Find the value of x such that x° and 60° form a pair of complementary angles.
Solution:
If x° and 60° form a pair of complementary angles, we will solve the equation x° + 60° = 90°^{ }to find the value of x.
x° + 60° = 90°
x° = 90°  60°
x° = 30°
Therefore, the value of x is 30°, which is the complementary angle of 60°.
Now, use the calculator and find the complementary angles for the following:
 35°
 23°