Supplementary Angle Calculator

Calculate Supplementary Angle
Enter Angle A

Supplementary Angle

Supplementary Angle Calculator is a free online tool that displays the supplementary angle for the given angle measure. BYJU’S online Supplementary angle calculator tool makes the calculation faster, and it displays the answer in a fraction of seconds. 

If two angles are supplementary then their sum is equal to 180 degrees.

What is the supplementary angle of 45°? Find the answer using the supplementary angle calculator given above.

Also check: Angle Calculator

How to Use the Supplementary Angle Calculator?

The procedure to use the supplementary angle calculator is as follows:

Step 1: Enter the angle in the input field

Step 2: Now click the button “Solve” to get the result

Step 3: Finally, the supplementary angle for the given angle will be displayed in the output field

What is Meant by Supplementary Angle?

In Maths, two angles are said to be supplementary, when the angles add up to 180 degrees. The supplementary angle need not be adjacent to each other, but their sum should be equal to 180 degrees. For example, 95° and 85° are supplementary angles.

Solved Example – Supplementary angle calculator


To find out another angle if one of the supplementary angles is 100°


We know that the sum of supplementary angles is 180°

Let the unknown angle be x


100° + x = 180°

X = 180° – 100°

X = 80°

Hence, the unknown angle is 80°


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