A+B+C=180

A+B+C=180

​Steps to solve for the missing angle

​Step 1: Use equation A+B+C=180

​Step 2: Plug in all angels from picture

​Step 3: Add together the similar parts of the equation (All regular numbers will go together, all numbers with x's attached go together)

Step 4: Solve for the missing angle

​Solve for the missing angle

​Step 1: Use equation A+B+C=180

​Step 2: Plug in angles from picture (40+80+C=180)

​Step 3: Add together the similar parts of the equation

​*This would be 40 & 80 because they are both regular #'s (120+C=180)

​Step 4: Solve for the missing angle (C)

​How to show work