If the measure of 〈DBC is 180 degrees, how do you find the measure of 〈DBA?
You subtract 180 - 135 which gives you 45 degrees.
You add 180 + 135 which gives you 45 degrees.
You subtract 180 - 145 which gives you 35 degrees.
You add 180 + 135 which gives you 315 degrees.