For any triangle, the sum of the measure of the three angles equals 180 degrees. Two of the angles have the same measure,a,and the third angle measures 45 degrees. Which of the following equations could be used to determine the measure of a?
45+2a=180. You should always try to write down an equation for problems like these. Subtract the 45 to both sides of the equal sign. This gets you 2a=135. Divide the 2 on both sides and you get a=67.5 degrees. I hope that i helped, enjoy
