There are 180 degrees in a triangle. Two numerical values are given, 42 and 90. The last angle has a variable. To find the variable, we subtract the know values from 180.
All the angles in a triangle equal to 180 and the little square in the corner equals 90 degrees so if we do 180-(90+42)=48 so then 6x=48 so if you divide both sides by 6,you get 8
