Question

find the measure of the missing angle in the triangle shown 49° 57°

Answer 1

Ok, we know that there are 270 degrees in a triangle, so just add 49+57, the you'll get 106, 270-106=164. ANSWER: 164

Answer 2

In a triangle everything must add up to 270 degrees meaning that if there is already 49 and 57 you must add them both together so 49+57 is 106 so you would now have to subtract 106 from the total number of the triangle, being 270.
So the equation would have to be 270-106= 164. The missing angle that you are missing is 164 degrees