Question

find the value of c.

Explanation:

Step 1: Recall exterior - angle property

The exterior - angle of a triangle is equal to the sum of the two non - adjacent interior angles.

Step 2: Set up the equation

In the given triangle, $c$ is an exterior angle. So, $c=69 + 74$.

Step 3: Calculate the value of $c$

$c=143$.

Answer:

$143$