Answer:
17
Step-by-step explanation:
c is 45 and d is 60
c has one right angle (90) so 90 + a + a =180. 90 +2a = 180 so 2a = 180-90 (90).
90/2 is 45
therefore a = 45
d has all sides equal. so divide 180 (the total angle in a triangle) by 3 =60
