# In #triangleABC#, the interior angle at A is #51^circ# and the exterior angle at B is #119^circ#. The interior angle at C measures what?

##### 1 Answer

Apr 7, 2018

Interior angle at C measures

#### Explanation:

In a triangle sum of all the interior angles is

Now interior angle

as exterior angle

Hence interior angle at

**Alterative method**

As any exterior angle is equal to sum of both the interior opposite angles, exterior angle at

hence

and