Answer:
D 91
Step-by-step explanation:
Add 3 +2 =68 +23=91
Sum of any angle in atringle is 180 (rule)
Then 180-91 =89 (the missing angle in the traingle)
Since the sum of any straight angle is 180 (Therom)
180 - 89 =91
Or
The some of 2 interior angle in a triangle equal to the opposite exterior angle (Therom)
So 68 +23 = 91
