126 Explanation 18/-3-(-12)•(-1)•(-11) divide 18 by -3 and change signs on the 12 (-6)+12•(-1)•(-11) multiply 12 and -1 (-6)+(-12)•(-11) then multiply -11 and -12 -6+132 126
The purple arrows indicate that side are parallel, so we know that that triangle NMP is the same as triangle NOP. If they are they same then we know that ∠1 and ∠2 equal 60° since the opposing angles equal 60°.
For ∠3 we look at the opposing angle and now know it is 60°. Since ∠3 and the opposing angle make a straight line which equals 180°. We can figure out ∠3 by subtracting 60 from 180 = 120°.
