Answer:
m = 18
n = 60
Step-by-step explanation:
The sum of interior angles in a triangle is equal to 180.
We can write the following equation to find, first value of m, then the value of n:
65 + 42 + 55 + m = 180 add like terms
162 + m = 180 subtract 162 from both sides
m = 18
Now the value of n:
65 + 55 + n = 180 add lik terms
120 + n = 180 subtract 120 from both sides
n = 60
