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?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.