Answer:
-4
Step-by-step explanation:
1st Step:
Set up our equation, so we get x + 69 + 25 + 90 = 180
Remember: All sides of a triangle add to 180.
2nd Step:
Now that we've got our equation: x + 184 = 180. Subtracting 184 from 180 gives us -4, which is our answer.
Key Points To Remember:
- The angles of a triangle always add up to 180.
- The little square at the bottom of the triangle means the angle is 90.
