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Find the missing angle in a triangle




 


We use the property that the angles of a triangle add up to 180 degrees.
Step 1:
Find the given angles
Step 2:
Subtract the given angles from 180 to get the missing angle.

Worksheets to find the missing angle in a triangle


Angles of Triangles Add Up To 180 Degrees
Ex: Could a triangle have the given angle measures?
a) 115, 35, 30
b) 45, 45, 60
Angles of Triangles Add Up To 180 Degrees
Since all three angles add up to 180 degrees, you can find the missing angle by subtraction.



Angles of Triangles Add Up To 180 Degrees - Find two missing angles that are equal.
How to Find the Missing Angle in a Triangle.


 
How to find a missing angle in a triangle


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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