Find the value of x if ABC = DEF.
(If triangle ABC and triangle DEF are congruent)

C. 75

Step-by-step explanation:

The answer is 75 because the interior angles of a triangle add up to 180 degrees. So, the steps in solving this equation are:

1. Add 45 and 60 together, when done it equals 105.

2. Since all interior angles add up to 180, you need to subtract 180-105

3. When done, it equals 75 degress.

P.S. and because both triangles are congruent, meaning equal or the same, you can just use the angle measurements from the top triangle and work from there.

Hope this was helpful!! :)

step-by-step explanation: i dont